Senior citizens are advised to go in for some creative activities to keep themselves mentally young.
【正确答案】 C
【答案解析】解析: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。