38.The fact _____ the earth is round is true.

　　 A.that　 B.which　　　 C.what　　　 D.why

37.______ we need it is a different matter.

　　 A.If　　 B.Whether　　 C./　　　　 D.What

36.It doesn't matter ________we need it or not.

　　 A.whether　 B.if　　 C.that　　　　 D./

35._______the moon has no light of its own is a well-known fact.

　　 A.That　　 B.If　　 C.Whether　　　 D./

34._______he is a rich man is know to all in the city.

　　 A.Because　　 B.That　　 C./　　　 D.Who

33.They want to know _____________?

　　 A.whose umbrella is this　　　　 B.whose umbrella this is

　　 C.whose this is umbrella　　　　 D.whose is this umbrella

32.They want to know ________ do to help us.

A.what can they　 B.how they can　

C.what they can　 D.how can they

31._______ Mary always studies well is known to us.

　　 A.When　 B.Which　 C.That　　 D./

30.I wonder _________ Mrs Brown is still alive.

　　 A.if　 B.how　　 C.however　 D.that whether

29.These computers are different from _________.

　　 A.that we expected　　　　 B.what we expected

　　 C.which we have expected　 D.what we expect