用所给动词的适当形式填空，必要时刻加助动词或情态动词。

1. He _______ ever _______ (be) to the amusement park several times.

2. I'm sorry I didn't finish _______ (write) my composition.

3. I have been _______ (skate) for two hours.

4. _______ you _______ (teach) us computer science next year.

5. I went there last year and _______ (fall) in love with it.

6. They _______ (fly) to the moon in ten years.

7. I will go to the water park if it _______ (not rain) tomorrow.

8. When Mr. Cook got home, his son _______ (listen) to the radio.

9. The old man makes a living by _______ (sell) vegetables.

10. The box is too heavy.  I'm not strong enough _______ (carry) it.