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
But as far as I know, he once won the world champion at the Olympic Games.
15. at home with 对……很熟悉
She is at home with problems like this.
16. back out
退出
A：Wasn' t Bert supposed to sing tonight?
B：Yes, but he backed out at last minute.
不履行
She finally backed out of her promise.
17. be cut out for 适合于，有做某事物的天赋
She is cut out for a dancer.
18. be absorbed in 全神贯注于某事物
She has been absorbed in a horrorfiction. I can' t tear her away.
19. be addicted to 对某事物上瘾
She has been addicted to drugs for years.
20. be attached to 对某事物有感情
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.
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