19. Senior citizens are advised to go in for some creative activities to keep themselves mentally young.
A.search for
B.invest in
C.engage in
D.work out
A B C D
C
[解析] 有人建议老年人参加一些有创造性的活动,以使他们在精神上保持年轻。 go in for意为“从事,参与,致力于”。search for意为“搜寻”;invest in意为“投资”;engage in意为“从事,参加”;work out意为“制定”。根据题意,应选“从事,致力于”的近义词。故选C。
20. Attempts to restrict parking in the city centre have further aggravated the problem of traffic congestion.