Ⅰ. 用本模块恰当的单词补全语境
1. concentrate (集中)on my study
2. write an essay (文章)
3. pass(超过) the other runners
4. avoid the disadvantage(缺点) of the system
5. summarize the official statistics(统计数字)
6. shorten(缩短) the meeting in half
7. give a definite(明确的) answer
