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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. 答案 but For example，television sets need not be played at full volume (音量) loud pop music should not be played very late at night. 解析 考查并列连词。比如电视机不必开到最大音量并且响亮的流行音乐不应当晚上放到很晚。这里前后句之间为并列关系故用连词and。 答案 and 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 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 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。 答案 or It will be great | 
