117.He has failed me so many times that I no longer place anyon what he promises.

28.The fact iswe don＇t know the person at all.

27.The scientists have come to the conclusion, based on the signals and photographs sent back by thesatellite, there is no life on Venus.

26.Shanghai has experienced such great changes that everyone can recognize that it is no longer.

25.There can be no doubtsomeone had visited the house before they arrived.

24.一What did the teacher say to you just now?—She asked me.

23.his dream of going to college will come true is uncertain.

22.We considerthe machine should be adjusted each time it is used.

21.He kept silent, so I couldn11 knowhe agreed not.

20.Afterseemed ages, the newsman disclosed the facts.

19.comes back first is supposed to win the prize.