his thirties C. at his thirties D. about his thirties ( )12.The headmaster wrote a ___ report. A. two thousand words B.two-thousand-words C. two-thousand words D. two-thousand-word ( )13.____of the apples in the fruit bowl are soft and sweet. A. Two-third B. Second-third C. Two-thirds D. Second-thirds ( )14.We have learned about ____ these days. A. several hundreds English words B. hundreds of English words C. hundred of English words D. several hundred English word ( )15.A UN report says that the word population will pass six billion by the end of ____ century. A. twentieth B. twenty C. the twentieth D. the twentyth 五、介词 1. in; on; at 用在时间词前,表“在” 1)at + 具体时刻 2)on + 具体某天(具体某天的上、下午等;星期词;以及上、下午词前有修饰词时) 3)in + 年、月、季节及一天中的某部分但注意: at night= in the night at noon at this / that time at Christmas
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