完形填空。 Don't waste precious (宝贵的) time because time __ 1 __ will never return. Time passes very quickly. Some students __ 2 __ they do not have enough time __ 3 __ prepare all their lessons. That's because they do not know __ 4 __ make sure of their time; __ 5 __ they waste it in doing some useless things. Why do men work? Why do they study? Why do we go to school __ 6 __ in the morning? What do trains run so fast? Why do __ 7 __ people prefer taking buses instead of __ 8 __? The __ 9 __ is very simple: we wish to save time because time is precious. Remember that time is more valuable than money. (     )1. A. lose (     )2. A. tell (     )3. A. to (     )4. A. how to (     )5. A. because (     )6. A. still (     )7. A. such a few (     )8. A. walking (     )9. A. problem B. losed B. talk B. at B. how B. or B. early B. such money B. work B. answer C. lost C. say C. for C. why C. why C. late C. so few C. to walk C. question D. last D. speak D. with D. where to D. how D. even D. so many D. walked D. reply