1.After Mrs. Wang had returned to her house from work, she was cooking dinner
-> cooked
2. Jimmy threw the ball high in the air, and Betty catching it when it came down.
-> caught
3.Linda has worn her new yellow dress only once since she buys it.
-> bought
4. Last week Mark told me that he got very bored with his present job and is looking for a new one
-> was looking
5. Having fed the dog, he was sat down to his own meal.
-> sat
6.When I turned on my computer, I was shocked to find some junk mail,and I delete it all.
-> deleted
7.They are going to have to leave soon and so do we.
-> so are
8. The boss laughed when the secretary has told him that she really needed a pay rise.
-> told
9. The telephone rang several times and then stop before I could answer it.
-> stopped
10. Debbie, whose father is an excellent tennis player, has been playing tennis since ten years.
-> for
CHÚC BẠN HỌC TỐT^^