VI．单句填空（共10个空格；每空格1分，满分10分）
阅读下面句子，按照句子结构的语法性和意义连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。
91. I suggested the thief ________ (refer) to be put into prison.
92. You can’t imagine what great difficulty they have ________ (solve) the problem
________ (discuss) now.
93. You should understand the traffic rules by now. You’ve had them ________ (explain) to you often enough.
94. When first ________ (introduce) in the market, these products enjoyed great success.
95. We cannot be sure ________ our dreams will come true, but we can at least be hopeful ________ our efforts to improve the world will be successful.
96. To my delight, she will give ________ needs help a hand.
97. That was a time ________ there were no radios, no telephones or no TV sets.
98. What is known to all is that the old scientist, for ________ life was hard in the past, still works very hard in his eighties.
