16, back out 1) 退出 A: Wasnt 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 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. 2深圳英语口语外教那家好，163yingyu.com怎么收费0，be attached to 对有感情 A: Im 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 Ive actually been quite attached to it. 21, back up 1) 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. 22, be bound for 到地方 The bus is bound for New England. 23, be (feel) 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. 26, be he所以对于儿童英语的启蒙，fshuamiao.COM家长们是越来越关注ad and shoulders above 好许多 In calculus, Joe is head and shoulders above his classmates. 27，be in the dark 蒙在鼓里 A: Do you have any idea what his notice is about? B: Im as in the dark as you are. 28，be stuck 卡住了 I cant get this window open. Its stuck. 29, bite off more than one can chew. 贪多嚼不烂 A: I hear youre taking an advanced physics course this semester. B: I think Ive bitten off more than I can chew. 30, break new ground 有了新的突破 His architectural design broke new ground in the field.