Complete the sentences.

1. She has been away from home ..... a long time. 
2. When the teacher came in all the pupils (play).....
3. She (practise) ..... the piano all the afternoon. I hope she'll finish soon.
4. We went for a walk after we (leave) ...... the office.
5. She wanted to know if we (make) ..... all the arrangements tomorrow.
6. She won't express an opinion until she (know)..... all the facts.
7. By the end of next week he (sell) ..... most of his books.