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

　　As far as I know, we will have a test next Monday.

　　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 沉浸在……

　　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.