202. This method has played a great role in ___ studies.

　　　 (A) to improve　 (B) being improving　　　 (C)　 improved　　 (D) improving

201. It is no___arguing about it, because he will never change his mind.

　　　 (A) use　　　　 (B)　 help　 (C)　　 time　　　　　　　 (D) which

200. ___ their homework, the children went for a walk.

　　 (A) When they were doing　 (B) After they have done　 (C)Doing (D) Having done

199. Professor Black had us ___ compositions every Friday.

　　　 (A) to write (B) written　 (C)　 write　　 (D) wrote

198. This book isn't well written. I don't think it worth ___.

　　　 (A) to buy　 (B) to be bought　　　 (C)　 buying　 (D) being bought

197. My father has given up___and now prefers eating sweets.

　　　 (A) to smoke　 (B) smoking (C)　 smoke　 (D) being smoked

196. You didn't hear us come in last night. That's good. We tried　 　 noisy.

　　　 (A) to be not　 　 (B) not to be　 (C)　　 not be　 (D) be not

195. I have a letter from your uncle.　 Do you object ___ it?　

　　 (A) to my reading　　 　 (B) that I read (C)　 from my reading　　　 (D) to I read

194. A student must learn____.

　　 (A) that his time needs a wise use (B) how to use his time in a way which is wise

　　 (C)　 to make wise use of his time　 (D)　　 wise ways in his time's use

193. Comrade Li often sees comrade Chen Jingrun ____mathematics in his study late at night.

　　　 (A) to work hard at (B) works hard at　　 (C)　 work hard at　　　 (D) hard work at