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一、根据句意及汉语提示写单词。 1. You should have your class in high ______( 精神) . 2. I like both of the books. Which one should I buy? It’s hard to make the ______ ( 决定) . 3. Michael has a poor ______ ( 感觉) of direction and he often gets lost. 4. If you have any questions to ask, don’t keep ______ ( 沉默的) .