64. Three fourths of the surface of the earth ______　 sea.

　　　 A. is　　　　　　 B. are　　　　　　 C. were　　　　　 D. has been

63. All life on our planet______ in one way or another upon the sun.

　　　 A. depend　　　　 B. depending　　　 C. depends　　　　 D. depended

62. A library with 5030 books ______ to the nation, as a gift.

　　　 A. is offered　　 B. has offered　　 C. are offered　　 D. have offered

61. A11 but one　 _______ here just now.

　　　 A. is　　 B. was　　 C. has been　　 D. were

60. ________ from his clothes, he is not so poor.

　　　 A. Judged　　　　 B. Judging　　　　 C. To judge　　　 D. Having judged

59.______ a reply, he decided to write again.

　　　 A. Not receiving　 B. Receiving C. Not having received　 D. having received

58.We must do whatever we can _____ those who are in trouble.

　　　 A. to help　　　　 B. help　　　　　　 C. helping　　　 D. do help

57.It was _______ in which Tom made great progress in English.

　　　 A. time　　　　　 B. a time　　　　　 C. one time　　　 D. sometime

56.-- I am going to the shop.--______ you are there, can you buy me a pen ?

　　　 A. As　　　　　　 B. While　　　　　 C. Because　　　 D. With

55. It happened to be very cold _____the morning of our sports meet.

A. at　　　　　　 B. of　　　　　　　 C. on　　　　　　 D. with