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.

1. Almost everybody leave by the time we arrive.

2. He wonders whether he leaves his wallet at home.

3. The secretary didnot leave until she finished her work.

    The couple scarcely enter the house when they begin to argue.

4. The teacher asked the boy why he didnot do his homework.

5. She has already posted the letter when she realized she sent it to the wrong address.

     Chúc bạn học tốt~~

1.had left/arrived

2.wondered/had left

3.didn't leave/had finished

4.asked/hadn't done

5.has already posted/realized/had sent