1，a change of pace 步伐变换You can do these chemistry experiments all day long. You certainly need a change of pace.2, a far cry from 相距甚远 The published book is far cry from the early manuscript.3, and how 的确 A: Shes a good dancer. B: and how.4, a matter of time 时间问题 It is only a matter of time.5, a phone call away 一个电话之远，想过来帮忙。If you need my help, do let me know. Just remember I am a phone call away.6, a while back 不久以前7，all along 一直 I knew it all along.8, anything but 绝对不 I was anything but happy about going.9, account for 讲解 How do you account for it?10, after all 到底A: Ive just seen the X-rays and your teeth look just fine,B: I see. Then there is nothing to worry about after all.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 sbs 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..很了解 She is at home with problems like this.16, back out1) 退出A: Wasnt Bert supposed to sing tonight? B: Yes, but he backed out at last minute2)不履行 She finally backed out of her promise.17, be cut out for 天生合适 Im not cut out to be a hero.18, be absorbed in She has been absorbed in a horror fiction. I cant 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: Im amazed that you are still driving that old car of yours. I thought you would havegotten rid of it years ago. B: It runs well and Ive actually been quite attached to it.21, back up1) 累积 The subway is running behind schedule, and traffic is backed up for blocks. I dont know if well make the 6:30 show.2) 支持 Ill back it up.[page]22, be bound for 到地方 The bus is bound for New England.23, be myself 找到自我 Im feeling myself again.24, be burned up 生气 She was really burned up at the news.25, be hard up for Im hard up for clothes, but I have a lot of books.