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.