198. The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.

　A. held on B. worked out C. touched on D. kept out of

197. At first the institute refused to purchase the telescope, but this decision was _____ revised.

　A. occasionally B. consequently C. successively D. subsequently.

196. No one imagined that the apparently _____ businessman was really a criminal.

　A. respectful B. respectable C. respective D. respected

195. We won't know whether it will be successful. We won't know whether there will be good _____.

　A. ends B. results C. effects D. causes

194. The government placed _____ on the numbers of foreign cars that could be imported.

　A. limitations B. restraint C. requirements D. restrictions

193. He ate what he could, and gave the _____ of the food to the birds.

　A. remain B. uneaten C. rest D. part

192. Mary had taken _____ to see that her guests had everything that they could possibly want.

　A. efforts B. pains C. attempts D. endeavors

191. It isn't so much whether he works hard; the question is whether he works _____.

　A. above all B. in all C. at all D. after all

190. Expected noises are usually more _____ than unexpected ones of the like magnitude.

　A. manageable B. controllable C. tolerable D. perceivable

189. Experts say walking is one of the best ways for a person to _____ healthy.

　A. preserve B. stay C. maintain D. reserve