100. ______ a problem requiring multiplication or division, the computer solves it by adding or subtracting.

A. Giving　　 B. Having given　　 C. Being given　　 D. Given

99. 　 The electric shaver ______ before it can be used.

A. needs repairing　　 B. requires to repair

B.　　　 should be in repair　 D. has to be repairable

98. 　 He could do little except ______.

A. writing　　 B. write　　 C. written　　 D. to write

97. 　 He listened to me ______ what Mr. Smith had said the day before.

A. to repeat　　 B. to be repeated　 C. to repeating　　 D. repeat

96. 　 All that it does is ______ the place of a house wife.

A. takes　　 B. taking　　 C. take　　 D. being taken

95. 　 At last they succeeded ______ the job.

A. to persuade him to take　　 B. in persuading him to take

C. to persuade him taking　　 D. in persuading him taking

94. 　 Before the invention of aero-planes, ______ in the sky like a bird was only a dream.

A. men fly　　 B. to fly　　 C. for flying　　 D. man flys

93. 　 When they met, Leonard and his enemy were fighting ______.

A. killed each other　　　 B. to kill each other　　

C. killing each other　　 D. to be killed each other

92. 　 I believe ______ very largely due to mistaken views of the world.

A. this unhappiness are　　　 B. to be this unhappiness

C. this be unhappiness　　　 D. this unhappiness to be

91. 　 Another feature worth ______ is the role of information throughout a feedback control system..

A. noticed　　 B. noticing　　 C. being noticed　　 D. notice