9.He _______ lives in the house where he was born.

51.Not all Americans are interested in sports, of course.

50.Don't believe whatever he tells you.

49.It is known to all that exercises are good for health.

48.You needn’t go there anymore. He already knows about it.

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.