21. back up

　　1) 累積

　　The subway is running behind schedule. and traffic is backed up for blocks. I don't know if we'll make the 6:30 show.

　　2) 支持

　　I'll back it up.

　　22. be bound for 到……地方

　　The bus is bound for New England.

　　23. be (feel) myself 找到自我

　　I'm feeling myself again.

　　24. be burned up 生氣

　　She was really burned up at the news.

　　25. be hard up for

　　I'm hard up for clothes, but I have a lot of books.

　　26. be head and shoulders above 好許多

　　In calculus. Joe is head and shoulders above his classmates.

　　27. be in the dark 蒙在鼓里

　　A: Do you have any idea what his notice is about?

　　B: I'm as in the dark as you are.

　　28. be stuck 卡住了

　　I can't get this window open. It's stuck.

　　29. bite off more than one can chew. 貪多嚼不爛

　　A: I hear you're taking an advanced physics course this semester.

　　B: I think I've bitten off more than I can chew.

　　30. break new ground 有了新的突破

　　His architectural design broke new ground in the field.

　　31. benefit concert 慈善音樂(lè)會(huì)

　　We need to let everyone know about the benefit concert, but we don't have much money for advertising.

　　32. busy signal 占線(xiàn)

　　I've been calling David for the past half hour, but I keep getting a busy signal.

　　33.between you and me 你我之間，保密

　　34.call for

　　A.打電話(huà)找

　　Tom just called for you.

　　B.預(yù)報(bào)

　　The forecast calls for heavy rain again tonight. Aren't you glad we'll be getting away from this for a week?

　　C.問(wèn)

　　It's probably in the new part of town. We'll have to call for directions.

　　35. call it a day 就此結(jié)束

　　A: I'm really glad our club decides to raise money for the children's hospital and most of the people we've phoned seemed happy to contribute.

　　B: Yeah. I agree. Now we've gone through all the numbers on our list now, so I guess we can call it a day.

　　36.cash the check 兌現(xiàn)支票

　　Have your sister cashed her paycheck?

　　37.clear off 收拾，整理

　　It's about time we clear off the desk.

　　38.come down (雨，雪)下起來(lái)

　　The heavy rain is coming down. now.

　　39. come in first in the race 比賽第一名

　　Not only did Jill come in first in the race but she also had her best running time of the season.

　　40.come what may 不管怎樣

　　We'll pick you up tomorrow at eight. come what may.