用括号内所给动词的适当形式填空，并将答案写在答题卡标有题号的横线上。
【小题1】Many great changes have taken (take) place in China during the past 10 years.
【小题2】We should think about all we can do to prevent (prevent) animals and plants from being endangered.
【小题3】Today, to hold the Olympic Games is considered (consider) as a rich prize for a country.
【小题4】The engineers were searching (search) for some information on the Internet in the laboratory when Mr. White arrived.
【小题5】Jack and Susan had known (know) each other since they were children, so nobody was surprised to hear that they got married.
【小题6】He promised that he wouldn’t forget (not forget) to hand in his report before weekend.
【小题7】The patient jumped excitedly when he heard his illness could be cured (cure).
【小题8】We should try out best to stop those factories polluting (pollute) the rivers again.
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解析：
【小题1】本句的含义为在刚过去的10年，中国发生了许多重大的改变，本题表示的是完成时态，结构为have+动词过去分词，故本句空格处填have taken。
【小题2】本句的含义为我们应该考虑我们应该做什么来阻止动植物的濒临灭绝，表示目的使用动词不定式to prevent。
【小题3】本题表示被动的含义，使用被动句，结构为be+动词考虑的过去分词considered，故本句空格处填is considered。
【小题4】本句的含义为工程师正在网上搜寻一些信息，本题的主句为过去进行时，结构为were+现在分词searching，故本句空格处填were searching。
【小题5】本句的含义为杰克和苏珊自从他们是孩子的时候，他们就认识了，本题主句使用过去完成时，结构为had+动词认识的过去分词known，故本句空格处填had known。
【小题6】本句的主句为过去时，从句为过去将来时的否定形式，使用wouldn’t+动词忘记的原形forget，故本句空格处填wouldn’t forget。
【小题7】本句的从句是含有情态动词的被动句，结构为can be+动词的过去分词cured，故本句空格处填be cured。
【小题8】本句的含义为我们竭尽全力地阻止工厂污染河流，stop +地点 from doing表示阻止某地做某事，故本句空格处填污染的动名词形式polluting。