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I.1-5 BBCCA
II. 1. hurry 2. questions 3. crowded 4. among 5. Finally
III. 1. What is, doing 2. Whatshould, do 3. should not 4. No, needn’t 5.betternot
IV. 1. spreading easily among 2.keep away from / not go to 3. work on 4. allthe time
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