4. Teenagers need their parents to       (引導(dǎo)）them.  

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(   ) 3. We should encourage students       the environment.

A. protect    B. protecting

C. to protect    D. destroy

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 2. We use stamps to post letters.(改為被動(dòng)語態(tài)）

Stamps               to post letters.

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4. Let's go to the cinema instead of       (watch) TV at home.

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5. 聽，有人在哭著求救。

Listen，someone is__________  ________      

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4. It takes people 30 minutes       (go) from here to the airport.

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從方框中選擇適當(dāng)?shù)木渥友a(bǔ)全對話。

A：Hi,Kangkang！Can you tell me something

about electricity? B：Yes,it is very important to us. 1     

Just like fish can't live without water. 

A: 2     

B：Yes,you're right.

A：How can people produce electricity?

B: 3     

A;It's said that coal is very limited(有限的) and nuclear power is very dangerous. 4     

B：Yes，we can produce electricity from the sun，wind，water，even animal waste and so on.

A:5     

B：It's a pleasure. I think we should study hard to find more new ways of producing electricity. 


A.  It can be produced from coal or nuclear power.

B.   Oh, thank you for telling me so much.

C.   Nowadays, we can't live without electricity.

D.  So electricity is widely(廣泛地)used in our life，isn't it?

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1.__________ 2._______  3._________

4._______  5,_________

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3. Soil pollution is such a serious problem that we should do something       (reduce) it.

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2. Schools should teach students about road safety to a      traffic accidents.

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