76.It is a（ ）truth that man is the only animal that has the power to speak and reason.

49.Mrs. Green became a teacher in 2000. She will（ ）for twenty years by next summer.

48.Children under eighteen are not permitted to see such kind of books（ ）bad for their mental development.

47.Now that she is out of a job, Lucy（）going back to school, but she hasn’t decided yet.

46.Recently I bought a jade bracelet,（ ）was very reasonable.

45.A solid is different from a liquid（）the solid has definite shape.

44.—— What will you buy for your mother’s birthday?—— I want to buy a（）wallet for him.

43.He is very（ ）to call me tonight. I can sense that.

42.You should take the medicine now. It will（ ）you pain in your stomach.

41.It is certain that he will（ ）his business to his only daughter when he gets old.

40.The（ ）production of engines in our factory has doubled this year.