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21. look for 寻找 , wait for等候 , look after=take care of照看, look like看起来像 , look over检查,复习 , look out小心,从里向外看 , look the same看起来一样, look up向上看,查单词 , look around环视look forward to期望 , look through温习,检查

22. set off 出发、动身, put off 推迟 , keep off 避开、不靠近… drop off放下(某物),turn off关 , jump off跳离 , take off脱(衣),(飞机)起飞

23. half a kilo半千克 , half an hour半小时 , in half分成两半, half of the day半天

24. do eye exercises做眼保健操 , do morning exercises做早操take (more) exercise (多)参加体育锻炼 , an exercise book练习本

25. take part in参加 , hand in上交 , in hospital住院 , in surprise吃惊地 , in the sun在阳光下 , in trouble处于困境, in a minute / moment马上

26. leave for…动身去某地

27 feed on 以…为主食 , live on继续活着 , base on以…为根据 , carry on坚持、继续下去 , and so on 等等 , on the other hand另一方面 , on foot步行 28.be famous for以..著名 , be excited about n./V-ing对…感到兴奋 , be interested in 对…感兴趣 , be born出生 , be busy with sth.- be busy doing sth.忙于…be amazed at 对..感到惊讶

29.move away移开 , move to(搬)移到

30.search the Internet上网