课前预习 【短语】 19.be used to习惯于……;适应于……20. take risks 冒险 21. run out of·……用完了……22. cut off切除,切断23. get out of离开;从……出来24. be in control of掌管;管理25.give up放弃 26. have problem doing在做方面有困难27. because of____因为 28. make a decision作出决定29. keep on 继续