4. While I (do) my homework,the phone rang.

5. None of us should use paper (napkin) .

3. Saving water (be) one thing we can do for our world.

Ⅰ.用所给词的正确形式填空

1. I stopped (use) plastic bags last year.

2. That house is (real) old and dangerous.

WeJd better pull it down.

5. —We shouldn’t spend too much time on computer games; it's bad for our eyes.

— !

A. I agree with you   B. That's all right   C. Enjoy your time   D. Good luck

4. It is really dangerous to play with fire. Stop

that!

   A. to do   B. doing   C. do   D. did

3. too much sweet is bad for your teeth.

   A. Eat        B. Eats

   C. Eating   D. Eatting

2. Chen Guangbiao says he all his money to charities when he dies.

   A. leaves       B. left

   C. will leave   D. would leave

I.单项选择

1.I am is  not good at English. I think it's not easy a foreign language well.

   A. learn            B. to learn

   C. learned         D. learning

5. I think we would never (do) harm to the animals.

4. My father used (go) to work by car,but now he takes the bus.