我集中精力读书。
15. be certain of
确信;
[例句]Brazil need to beat Uruguay to be certain of a place in the finals
巴西必须击败乌拉圭才能确保进入决赛。
16. at best
顶多; 至多, 充其量;
[例句]We can only finish half of it this afternoon at best.
今天下午我们充其量只能完成一半。
17. by chance
碰巧; 偶然地,意外地; 无意之中; 偏巧;
[例句]I met her by chance on the street.
我恰巧在街上遇到了她。
18. in charge of
主管,负责; 照料;
[例句]He is in charge of the school work.
他负责学校工作。
19. round the clock
昼夜; 日夜; 夜以继日; 日以继夜;
[例句]He often works round the clock.
他经常通宵达旦地工作。
20. in common
共有; 同;
[例句]We happened to discover we had a friend in common
我们凑巧发现我们有一个共同的朋友。
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