284. One learns a language by making mistakes and ___them.

　　　 A. correct　 B. correcting　 C. corrects　 D. to correct　　　　

283. ----Why haven’t you bought any butter?

　　　 ---I _____ to but I forgot about it

　　　 A. liked　 B. wished　 C. meant　 D. expected　　　　　　

282._____at the door before entering please.

　　　 A. Knocked　 B. To knock　 C. Knocking　 D. Knock　　　　

280.__the general state of his health, it may take him a while to recover from the operation.

　　　 A. Given　 B. To give　 C. Giving　 D. Having given　　　　

[　 ]281 The picture ___on the wall is painted by my nephew.

　　　 A. having hung 　B. hanging　 C. hangs　 D. being hung　　

279._____some of this juice---perhaps you’ll like it

　　　 A. Trying　 B. Try　 C. To try　 D. Have tried　 　　　　　

278.The managers discussed the plan that they would like to see ____the next year.

　　　 A. carry out　 B. carrying out　　　 C. carried out　 D. to carry out

277. I’ve worked with children before, so I know what ___in my new job.

　　　 A. expected　 B. to expect　 C. to be expecting　 D. expects　　

276. European football is played in 80 countries, ____it the most popular sport in the world.

　　　 A. making　 B. makes　 C. made　 D. to make　　　　　　

275. Cleaning women in big cities usually get ___by the hour.　　　　

　　　 A. pay　 B. paying　　 C. paid　 D. to pay　　　　　　　

274. _____it with me and I’ll see what I can do.

　　　 A. When left　 B. Leaving　 C. If you leave　 D. Leave