26.　　 He told us about the countries where he had visited.

25、Who is the man whom you said hello just now?

24、This is the knife　 with that the doctor did the operation.

23、Those that want to go put up your hands.

22、It is one of the best pictures which have been sold.

21、A plane is a machine can fly.

20、The park stands at the place that the two rivers meet.

19、Do you know the young man whom has been chosen chairman?

18、The doctor whom they want to see have come.

17、The day which she had to leave arrived at last.