用所给动词的适当形式填空
1. We (paint) the house before we (move) in.
2. That rich old man (make) a will before he (die).
3. They (study) the map of the country before they (leave).
4. The robbers (run away) before the policemen (arrive).
5. We (learn) about 4000 English words by the end of last term.
6. We were surprised at what she already (do).
7. She (not go) to Qingdao because she (go) there before.
8. He said he already (give) the book to the teacher.
9. She told me she (be) to Sanya three times.
10. She (play) the guitar while her sister (sing).