21. look ~ :
look for 寻找 wait for等候
look after=take care of照看
look like看起来像 look the same看起来一样
look over检查,复习 look through温习,检查
look out小心,从里向外看 look up向上看,查单词
look around环视 look forward to期望
22. ~ off :
set off出发、动身 put off推迟 turn off关
take off脱(衣),(飞机)起飞 jump off跳离
keep off避开、不靠近… drop off放下(某物)
23. half ~ :
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. ~ exercise :
do eye/morning exercises做眼保健/早操
take (more) exercise(多)参加体育锻炼
an exercise book练习本
25. ~ in :
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. ~ on :
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 ~ 介词:
be famous for以..著名 be born出生
be excited about +n./V-ing对…感到兴奋
be interested in对…感兴趣
be amazed at对..感到惊讶
be busy with sth.=be busy doing sth.忙于…
29.move ~ :
move away移开 move to(搬)移到…
30.上网:
search the Internet上网