21back up
1) 累积
The subway is running behind schedule, and traffic is backed up for blocks. I dont know if well make the 6:30 show.
2) 支持
Ill back it up.
22be bound1 for 到地方
The bus is bound for New England.
23 be myself 找到自我
Im feeling myself again.
24 be burned up 生气
She was really burned up at the news.
25be hard up for
Im hard up for clothes, but I have a lot of books.
26be head and shoulders above 好很多
In calculus2, Joe is head and shoulders above his classmates.
27be in the dark 蒙在鼓里
A: Do you have any idea what his notice is about?
B: Im as in the dark as you are.
28be stuck 卡住了
I cant get this window open. Its stuck.
29bite off more than one can chew3. 贪多嚼不烂
A: I hear youre taking an advanced physics course this 百度竞价推广ester4.
B: I think Ive bitten off more than I can chew.
30break new ground 有了新的突破
His architectural5 design broke new ground in the field.
31benefit6 concert 慈善音乐会
We need to let everyone know about the benefit concert, but we dont have much money for advertising7.
32busy signal8 占线
Ive been calling David for the past half hour, but I keep getting a busy signal.
33between you and me 你我之间，保密
34call for
A,打电话找
Tom just called for you.
B,预报
The forecast calls for heavy rain again tonight. Arent you glad well be getting away from this for a week?
C,问
Its probably in the new part of town. Well have to call for directions.
35call it a day 就此结束
A: Im really glad our club decides to raise money for the childrens hospital, and most of the people weve phoned seemed happy to contribute9.
B: Yeah, I agree. Now weve gone through all the numbers on our list now, so I guess we can call it a day.
36cash the check 兑现支票
Have your sister cashed her paycheck?
37clear off 整理，整理
Its about time we clear off the desk.
38come down 下起来
The heavy rain is coming down, now.
39come in first in the race 比赛1、
Not only did Jill come in first in the race but she also had her best running time of the season.
40come what may 不管如何
Well pick you up tomorrow at eight, come what may.