13.- Do you mind my smoking here?
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47.I knocked on his door but nobody came to answer it.

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

45.It has not been decided yet whether they will take part in our experiment.

44.This one's pretty, but it costs too much.

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

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.