Поставить глаголы в правильной форме:

Betty was drinking coffee while she (to wait for) her friend.
2. How long you (to live) in this town?
3. When my mother came home I (to do) housework already.
4. If Simon (to arrive) in time we shall go for a walk.
5. Why are you so dirty? – I (to work) in the garden all morning.
6. Don’t phone her now. She (to study).
7. You look busy. – I am. I (to write) a letter to my brother.
8. You sounded tired when I spoke to you last night. – Well, I (to paint) the house all day.
9. Have you sent these letters yet? – Yes, I (to post) them yesterday.
10. Are there any biscuits left? – Sorry, I (to eat) them all.