44. Put the verbs in the brackets in the correct form.
1. What you (do) when I (call)?
2. Mary (telephone) while I (read) your letter.
3. I (sleep) when she (come).
4. Mary (clean) the room when Tom (come).
5. He (go) into his office when I (see) him.
6. He (have) breakfast when Tom (come).
7. The students (still write) when Tom (arrive).
8. The airplane (takc) off six minutes ago.
9. She (not smoke) a cigarette since January.
10. She often (play) there alone.
11. She (fall) while she (play) with friends.
12. It (rain) when we (arrive).