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 the day before yesterday.
5. We ______ (learn) English for more than two years.
6. When he ____________(finish) his work, he ____________(ring) me up.
1. has been 2. have been ; went ; saw 3. has gone 4. planted ; did
5. have been learning 6. finishes ; will ring