摘要： The world’s population problem will be serious all the countries do something to control it. A. or B. but C. unless D. and ( )1 4. I can’t swim, and he can’t swim . A. also B. too C. either D. neither ( )1 5. of the students boys in our class. A. One fifth; are B. One fifths; are C. First fifths; is D. One five; is ( )1 6. the strong wind, they had to shut up all the windows. A. Because of B. Because C. Thanks to D. Thanks

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