11. allergic to 对|……过敏

Oh man! Something in this room is making my eyes itch, I must be allergic to something.

12. at sb’s service 愿为某人服务

I am at your service at any time.

13. around the clock 24小时不停

Martha studied around the clock for management exam.

    14. as far as I know 就我所知

15，at home with 对…..很熟悉

She is at home with problems like this.

16. back out

1) 退出

A: Wasn’t Bert supposed to sing tonight?

B: Yes. but he backed out at last minute

2)不履行

She finally backed out of her promise.

17. be cut out for 天生适合

I’m not cut out to be a hero.

18. be absorbed in

She has been absorbed in a horror fiction. I can’t tear her away.

19. be addicted to 对……上瘾

She has been addicted to drugs for years.

20. be attached to 对……有感情

A: I’m amazed that you are still driving that old car of yours. I thought you would have gotten rid of it years ago.

B: It runs well and I’ve actually been quite attached to it.