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1. He was very tired after doing this for a whole day， he felt very happy since the crop did “grow” higher. 解析 考查并列连词。根据句中的very tired和very happy可知，前后两分句之间是转折关系，故填连词but。 答案 but 2. For example，television sets need not be played at full volume (音量) loud pop music should not be played very late at night. 答案 and 3. you don't mind，I'll stop and take a deep breath. 解析 考查条件状语从句的引导词。句意：如果你不介意的话，我想停下来喘口气。表示“条件”要用if。 答案 If 4. the areas used for playing fields are often rough and rocky，millions of real balls go flat (变瘪) within 24 hours. 解析 考查原因状语从句的引导词。根据语境可知，“他们用于踢球的地方，常常是崎岖的，多石的”是“球变瘪”的原因，表直接原因要用because。 答案 Because 5. But the river wasn't changed in a few days even a few months. 解析 考查并列连词。河流在几天或甚至几个月之后没有多大的改善。否定句中通常要用or代替and。 | 
