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C1 Vocabulary & Pronunciation • 20 Mins Topic: Light Pollution & Dark Skies

Light Pollution & Dark Skies

Master 10 key terms to talk about night lighting, star observation, and environmental protection.

? How to use this lesson

👩‍🏫

For Teachers

Guide students through the 10 core words, then give them 10 minutes to finish the 16 practice items. Use the final 5 minutes for shadowing practice and review the answers together as a class.

🎓

For Learners

Read the word table and memory tricks first to learn each term. Next, complete all practice exercises and record yourself speaking each shadowing phrase to build confidence.

Word table

Explore the 10 target words across three thematic areas.

10 Core Words

Theme 1: The light

Word	Meaning	Common Collocations	Word Forms	Example Sentence	Memory Tip
floodlight	A large, powerful outdoor lamp used to illuminate broad areas.	harsh floodlight, install a floodlight	floodlight (n, v)	The new rules make it possible to keep the glare of the floodlight out of bedroom windows.	"Flood" + "light" = a light that floods the space with brightness.
spotlight	An intense lamp focused on a small area; or public focus.	in the spotlight, put a spotlight on	spotlight (n, v)	Environmental groups put a spotlight on wasteful outdoor lighting.	A single "spot" of bright light focused on one subject.
dusk	The time of day just before night falls.	at dusk, approach of dusk	dusk (n)	Birds return to their trees as dusk settles over the valley.	Picture the sky turning dim and dusty at the end of day.
illuminate	To light up or make something visible and bright.	illuminate the sky, brightly illuminate	illumination (n)	Shielded lamps illuminate the walkway without blinding pedestrians.	"Illum-" connects to "lumen", a measure of light output.

Theme 2: The sky

Word	Meaning	Common Collocations	Word Forms	Example Sentence	Memory Tip
constellation	A recognized pattern formed by a group of stars.	distant constellation, spot a constellation	constellations (pl)	We could see the Orion constellation clearly after the streetlights dimmed.	"Con" (together) + "stellar" (stars) = stars collected together.
starlight	The soft light coming from stars in the night sky.	faint starlight, clear starlight	–	Far from city lights, the mountain trail was lit only by starlight.	Simply "star" + "light": gentle light from distant stars.
twilight	The soft glowing light in the sky between sunset and night.	fading twilight, twilight sky	–	During twilight, the horizon turns deep blue before night arrives.	"Twi" means two or between: daylight fading into night.

Theme 3: The lamps

Word	Meaning	Common Collocations	Word Forms	Example Sentence	Memory Tip
lamppost	A tall metal or concrete pole supporting a streetlight.	street lamppost, tall lamppost	–	Workers installed a modern, hooded lamppost along the bike path.	A "lamp" attached to a tall "post" standing by the road.
fixture	A piece of lighting equipment fixed permanently in place.	shielded fixture, light fixture	–	Replacing an old outdoor fixture with a downward lamp saves energy.	Think of something "fixed" securely to a wall or pole.
brightness	The amount of light given off or reflected by an object.	intense brightness, adjust brightness	bright (adj)	Smart sensors lower the brightness of city lights during midnight hours.	"Bright" + "-ness" = the total measure of how bright a light is.

Practice

Complete all 16 practice tasks below (items 1–16).

16 Items

Items 1–4 Collocation Matrix: Match Verbs to Nouns

Select the best noun that forms a natural combination with each verb phrase.

1. Select the noun that naturally follows: "install a shielded ___"

____ fixture ____ constellation ____ starlight

2. Select the noun that naturally follows: "turn on a powerful outdoor ___"

____ twilight ____ floodlight ____ dusk

3. Select the noun that naturally follows: "stand in the public ___"

____ lamppost ____ spotlight ____ brightness

4. Select the noun that naturally follows: "reduce the overall ___"

____ brightness ____ constellation ____ fixture

Items 5–8 Gap-Fill: Complete with the Word Bank

Word Bank: twilight starlight dusk illuminate

5. The wildlife survey runs from dawn to ___.

____

6. Low-glare street lamps help ___ dark roads safely.

____

7. Deep in the mountains, the valley was lit only by faint ___.

____

8. The horizon showed a soft purple glow during fading ___.

____

Items 9–12 Choose the Word: Select the Meaningful Option

Choose the one word that best fits the natural meaning of each sentence.

9. Workers mounted a new shielded light on top of the tall ___.

____ a. lamppost ____ b. constellation ____ c. twilight

10. Astronomers pointed their telescope to observe a famous ___ called Orion.

____ a. dusk ____ b. constellation ____ c. fixture

11. We walked through the park during the ___ after sunset.

____ a. lamppost ____ b. floodlight ____ c. twilight

12. The public campaign put light pollution directly in the ___ of national news.

____ a. spotlight ____ b. starlight ____ c. lamppost

Items 13–16 Word Formation: Fill in the Correct Form

Change the word in brackets into its correct form using the forms from our vocabulary list.

13. Efficient street ___ reduces light glare in neighborhoods. (illuminate)

____

14. On clear nights, several star patterns or ___ are easy to identify. (constellation)

____

15. Using less ___ bulbs near dark sky parks protects wildlife. (brightness)

____

16. The sports stadium decided to ___ the field only during evening games. (a big outdoor lamp, used as a verb)

____

Shadowing

Listen, repeat, and record your pronunciation for all 12 items below.

12 Speaking Tasks

🗣️ Part A: Key Collocations (Items 1–4)

1. Collocation

harsh floodlight

[Bài tập luyện nói]

____

2. Collocation

shielded fixture

[Bài tập luyện nói]

____

3. Collocation

distant constellation

[Bài tập luyện nói]

____

4. Collocation

fading twilight

[Bài tập luyện nói]

____

💬 Part B: Short Sentences (Items 5–8)

5. Short sentence

We saw bright stars at dusk.

[Bài tập luyện nói]

____

6. Short sentence

Turn off the outdoor light to save energy tonight.

[Bài tập luyện nói]

____

7. Short sentence

The new lamppost lights up our whole street.

[Bài tập luyện nói]

____

8. Short sentence

Soft starlight makes the night sky look peaceful.

[Bài tập luyện nói]

____

🌟 Part C: Natural Everyday Sentences (Items 9–10)

9. Everyday sentence

We watched the quiet dusk turn into dark night.

[Bài tập luyện nói]

____

10. Everyday sentence

Shielded lights keep glare away from home windows.

[Bài tập luyện nói]

____

🎯 Part D: Focus Pronunciation Words (Items 11–12)

11. Target Word

/kɒnstəˈleɪʃn/

constellation

[Bài tập luyện nói]

____

12. Target Word

/ɪˈluːmɪneɪt/

illuminate

[Bài tập luyện nói]

____

Vocabulary & Pronunciation: Light Pollution and Dark Skies

Light Pollution & Dark Skies

? How to use this lesson

For Teachers

For Learners

Word table

Theme 1: The light

Theme 2: The sky

Theme 3: The lamps

Practice

Items 1–4 Collocation Matrix: Match Verbs to Nouns

Items 5–8 Gap-Fill: Complete with the Word Bank

Items 9–12 Choose the Word: Select the Meaningful Option

Items 13–16 Word Formation: Fill in the Correct Form

Shadowing

🗣️ Part A: Key Collocations (Items 1–4)

💬 Part B: Short Sentences (Items 5–8)

🌟 Part C: Natural Everyday Sentences (Items 9–10)

🎯 Part D: Focus Pronunciation Words (Items 11–12)

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