78. We took a great risk in doing the matter but it ______

　　 A. paid for　　　　　 B. paid off　　　　　　 C. paid back　　　　 D. paid out

77. By the time you return from abroad, I'm afraid, she__________

　　 A. had got married　　 B. has been married　 C. will have got married　　 D. will marry

76. __________ how to work the coffee machine, the boy was just standing there, at a loss.

A. Never being shown　　　　　　　 B. Having never been shown

C. Having not shown　　　　　　　 D. Not to show

75. Although he______ succeed throughout his life, he died an unknown..

A. had been looking forward to　　　　　　　 B. has beer dying for .

C. had been longing to　　　　　　　　　　　 D. has been hoping for.

74. Her arm was beginning to swell up ______the bee had stung(蛰) her.

　　 A. on which　　　　 B. where　　　　 C. that 　　　　　　D. at the part

73. With so many problems _______ to be settled, the newly-elected Prime Minister will, have a hard time.

A. remaining　　　 B. remained　　　 C. staying　　　　 D. stayed

72. Several years ago, the majority of Internet users ______ young people ______ between 18 and 35.

A. accounted for; aged　　　　　　　 B. were made up of; aged

C. consisted of; aging　　　　　　　 D. were made of; aging

71. Professor Lin is not much of a speaker, but when it ______ space technology, he'll become talkative.

　　 A. goes to　　　 B, comes to　　　　　 C. focuses on　　 D. talks about

70. They had no place to stay so I couldn't ______ them______.

　　 A. turn; out　　　 B. turn; over　　　　 C. turn; off　　　 D. turn; away

69. At minus 130℃,　 a living cell can be _______ for a thousand years.

　　 A. spared　　　　 B. presented　　　　 C. preserved　　 D. developed