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.