18.Measles(麻疹) ________ a long time to get over.

42.My classmate is much cleverer than I.

41.Fred was such a hardworking student that he soon came out first in the class.

40.I knocked on his door but nobody came to answer it.

39.We have made little progress.

38.This is the worst hospital I have ever seen.

37.These goods are not up to standard.

36.A lot of natural resources in the mountain area will be exploited and used.

35.The traffic jams during morning and afternoon rush hours are a headache in big cities now.

34.I was having a nap when suddenly the telephone rang.

33.Let's try something different.