单选题 《复合题被拆开情况》 No one could see time, stop the passing of time【C1】________quicken its passing. But we【C2】________ the earth revolves (自转) while it【C3】________round the sun. It takes the earth 24 hours to revolve once and we call it a day. It takes about 365.25 days【C4】________the earth to go round the sun and we call it a year. Our life is【C5】________, but we have a lot of things to do. So, we should【C6】________good use of our time. We should plan【C7】________we should do every day. Some people always postpone(推迟) doing things,【C8】________they can never finish their work on time. In a word, we should not leave today’s work【C9】________tomorrow. We should use time well by doing【C10】________useful.《问题》：【C9】