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.