1. He (leave) for London 2 years ago and I (not see) him since.
left - haven't seen
2. You (be) to the laboratory this week ?
Have you been
3. "You (be) here before ?"
"Yes, I (spend) my holidays here last year"
Have you been - spent
4. The performance (begin) at 7 o’clock and (last) for three hours. We all (enjoy) it.
began - lasted - enjoyed
5. “Your face (be) dirty, Tom.” “All right, I (wash) it.”
is - will wash
6. We (finish) all our housework by tomorrow evening.
will have visited
7. I suppose when I (come) back in two years time, they (pull) down all these old buddings.
come - will have pulled
8. We never (meet) him. We don't know what he looks like.
have never met
9. I (see) him in the library today. We (be) there together.
saw - were
10. “You (find) the key which you (lose) yesterday?”
“Yes. I (find) it in the pocket of my other coat.”
Have you found - lost - found
P/S: Lần sau bạn nên chép lại đề và đặt tiêu đề khái quát cho bài mà bạn cần hỗ trợ nhé