文档介绍：一、用所给的正确形式填空。
1. He ___ _____ ever _______ (be) to the History Museum several times.
2. —_______________ you ever _____________ (be) to the zoo?
—Yes. I ________ (go) there last summer. I _______ (see) many kinds of animals there.
3. —Where is Mr. Wang?
—He ______ (go) to the library. He wants to borrow some library books.
4. Rodgers ______ (plant) those trees. He _______ (do) it yesterday.
5. We ______ (learn) English for more than two years.
6. When he __________(finish) his work, he __________(ring) me up.
7. _____ you ________ (clean) the room?
Yes, we __________ (do) that already.
When ____ you ______ (do) it?We _____ (do) it an hour ago.
8. ______ he ______ (see) this film yet?
Yes. When _____ he _____ (see) it? He ______ it last week.
9. How many times _____you______ (be) there?
10. I _________ (read) the novel twice. It’s interesting.
11. She ________ (go) to Pairs, hasn’t she?
Yes. How ______ she _______ (go) there?
She _______ (go) there by air.
12. So far, many countries ______ (improve) their environment.
13. Mr Chen ______ (give)up smoking last year.
14. Mr Chen ________ (give) up smoking since last year.
二、按要求变换下列句型。
1. They have ever been to an English-speaking country. (一般疑问句)
_________ they ever ____________ to an English-speaking country .
2. She has been a flight attendant for two years. (对划线部分提问)
____________________ she _