用所给动词的正确形式填空（10分）

1. We know the earth  _______ (travel) around the sun.

2. Can you see the students _______ (plant) trees on the hill now?

3. ---Where's your father? ---He _______(clean) the car behind the house.

4. I am sure she ________ (be) a very good teacher in a few years.

5. He wanted my help. So I stopped ________ (help) him.

6. Was Jane very busy ________ (plan) a boat trip with you last night?

7. It is very important ________ (not give) your goldfish too much food.

8. The boss usually makes his workers ________ (work) for twelve hours every day.

9. David ________ (fall) off the tree and hurt his legs a moment ago.

10. Millie, __________(not frighten) the dog, or it will bark at you.