41,cost somebody an arm and a leg

　　A: Did you see the diamond ring Bill gave to Linda?

　　B: I sure did. It must have cost him an arm and a leg.

　　42, cut it out 閉嘴

　　I told you to cut it out.

　　43,be cut out for 生來時做……的

　　Dr. Hamilton doesn’t feel Larry is cut out for the medical profession.

　　44,department chair 系主任

　　I didn’t write that memo to the department chair.

　　45,dirt cheap 非常便宜

　　A: You’ve already furnished your apartment?

　　B: I’ve found some used furniture that was dirt cheap.

　　46, do with 用…..湊合; do without 沒有……也行

　　You can do with your girlfriend.

　　You can do without your girlfriend

　　47, dog tired 特別累，同義：run down; worn out; out of steam

　　I’m dog tired these days. I’m working on seven articles.

　　48, down jacket 羽絨服

　　49，drive somebody up the wall 讓某人發(fā)瘋;同義：drive somebody out of one’s mind

　　The sound of all that raffic is driving me out of my mind.

　　50, fall back on 依賴

　　A: Were you able to understand that French novel without any help from theteacher?

　　B: I did pretty well, but I had to fall back on my dictionary occasionally.