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1. No one has seen him anywhere this week.
2. Somebody has invited her to the party.
3. They have done all the exercises in written form.
4. They had done everything before we came.
5. I thought they had already sent the letter.
6. Evidently somebody had informed him of the news before they announced it.
7. They are constructing some new metro lines now.
8. Wait a little. They are exаmining the last student there.
9. They are discussing this question now.
10. We could not use the tape-recorder, they were repairing it.
11. When I switched on the radio they were broadcasting a very interesting programme.
12. They have not yet told him about it.
13. The branches of the tree hid her face.
14. I know her family. Her brother Charles has taken me there more than once.
15. I am sure your presents will please them.
16. They informed me that they 12had seen you in Oxford Street.

1.is seen;2.is invited;3.are done;4.are done;5.am sent;6.is informed;7.are construsted;8.are examined...