Thì quá khứ đơn và quá khứ hoàn thành: 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. 6. Hardly the car (go)… a mile when it (have)……………. a flat tyre. 7. The weather (be)……. far worse than we (expect)……….. 8. They (be married)……………. for five years when thy finally (have)………. a child. 9. No sooner they (sell)………. their car than they (regret)…………………. having done so. 10. When she (finish)………. her work she (go)……………. to the cinema.