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1. Biogas              (技術(shù))has been used in my hometown for nearly three years.

5. 砍太多的樹對我們的環(huán)境不好。

      too many trees is bad for our environment.

4. 行動勝于言辭。
         than words.

3. 離開前一定要切斷電源。

Be sure to      the electricity before you leave.

2. 你看起來臉色不好，你應(yīng)該去看醫(yī)生。

You don't look well, and you             go to see the doctor.

1 .你不應(yīng)該生他的氣，他畢竟才十歲。

You shouldn't be angry with him. He is only ten years old      

A: Hi,Alice. You should turn off the light.It saves electricity. 

B：Sony！ 1 I was just in a hurry.

A：I have just read a book about protecting our environment, and there are so many things we should do. 

B_: Like what?

A：Well. For example, we should turn off the shower when we are washing our hair.

B：I always do that. 2

A：It also says we ought to take our own bags when we go shopping. 

B：0h， that's easy. 3

A：Hum. Here's a good one. It says people should stop riding in cars or buses and

start riding bikes. 

B：Oh，I never do that！My school is only ten-minute ride from my home. 4 

A：Well，I think everyone should try to protect our environment. 

B_:5

A：OK. Let's start from ourselves.

1.______________

2. _____________ 

3. _____________ 

4._____________  

5. _____________ 

(   ) 5. You should learn to look after yourself.      ，you're not a child any longer.

A. In short    B. After all

C. In the end    D. As a result

(   ) 4. The little boy doesn't speak      his brother, but his written work is very good.

A. so well as    B. so better as 

C. as good as    D. so better as

(   ) 3. You       keep the water running all the time，because you're wasting water.

A. ought to    B. ought not

C. not ought    D. ought not to