91. Could _____ have been _____ who helped Sunny get her work done?

A. they … it B. they … them C. it … them D. it … they

92. I know a place _____ I can get a calculator on sale. I'll pick one up for you tomorrow.

A. where B. wherever C. how D. which

93. How teachers perform in their classes _____ a strong influence on the growth of the pupils.

A. has B. have C. having D. to have

94. I found the cat _____ under the bed, who had caught a mouse.

A. hiding B. hidden C. to hide D. having hidden

95. ---- How did he get back last night?
---- I think he _____ back on foot, as there were no buses or taxies then at all.

A. might have come B. needn't have come

C. must have come D. should have come

96. The doctor would allow him to go home _____ he remained in bed.

A. as though B. for fear that

C. on condition that D. as far as

97. One of the most important social problems of today is _____ jobs to the unemployed.

A. what to be given B. having given

C. how to give D. to have given 

98. The doctor said I was over-weight. If only I _____ less!

A. ate B. have been eating

C. have eaten D. had eaten

99. It is said that he got laughed at for _____.

A. his dishonest B. been dishonest C. being dishonest D. to be dishonest 

100. A baby animal knows animals of _____ own kind when it sees them, when it smells them and it hears them.

A. her B. one's C. its D. their

91. D 强调句

92. A

93. A

94. B

95. C

96. C on condition that= if

97. C 做表语的非谓语动词表示具体时间（将来）的行为，故用不定式一般时，排除 BD，短语中不缺少成分，排除A

98. D if only后用虚拟语气。此句中表示与过去事实相反。

99. C for介词,后接名词或相当于名词的短语或从句。

100. C