21．be meant／intended for打算给，打算用作

Is this valuable painting meant for me?

20．be up to应由……，轮到……

It's up to her to answer the question．

19．be content with对……感到满意

You should be content with what you have

18．be content to do sth．／with… 甘愿于干……；满足于……

I am content with your work this time．

17．be used to sth．／doing sth．习惯于……

My grandpa is not used to living in the noisy city

16．be proud of以……而自影骄傲

I am proud of being a Chinese．

15．be worth doing值得做……

　 The film is worth seeing again．

14．be fit to do／be fit for胜任；适合于

　 He is fit to do the work．

　 These books are not fit for children．

13．be about to do sth．正要做……

　　 1 was just about to go swimming when our guide saw me and stopped me．

12．be engaged to与……订婚

　　 My daughter is engaged to a nice doctor．