1. Almost everybody (leave)…………………………. by the time we (arrive)…………………………..
2. He (wonder)…………………………. whether he (leave)…………………………. his wallet at home.
3. The secretary (not leave)…………………………. until she (finish)…………………………. her work. The couple scarcely (enter)………. the house when they (begin)…………………………. to argue.
4. The teacher (ask)…………………. the boy why he (not do)…………………………. his homework.
5. She already (post)………. the letter when she (realize)………. she (send)………. it to the wrong address.