请写出所给单词的正确形式以补全下面的句子。The lifetime value of a person lies in his ____ (contribute) to his country and the society.
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请写出所给单词的正确形式以补全下面的句子。You need a rest. You have ____ (work) too much.
请写出所给单词的正确形式以补全下面的句子。Sevaral firms are seeking qualified ___ (apply) for the position of clerk typists.
请写出所给单词的正确形式以补全下面的句子。Teachers have to consider the increasing ____ (diverse) of reading materials.
请写出所给单词的正确形式以补全下面的句子。The guide had to call off the camping trip because few of the ____ (travel) had the proper equipment.