完形填空。 Don't waste time because time lost can never __ 1 __. Time passes very quikly. Some students say they do not have __ 2 __ time to do their lessons. They don't know __ 3 __ make use of their time. They waste it in watching TV, playing games,and __ 4 __ other useless things. Why do we go to school early in the morning? Why do most people __ 5 __  buses instead of (代替) __ 6 __? The answer is very easy: we wish to __ 7 __ time because time is precious (珍贵). We know that time is __ 8 __. When a man __ 9 __, his time has finished. __ 10 __  time is short, we must give our time to our studies or work. (     )1. A. lose (     )2. A. enough (     )3. A. how (     )4. A. do (     )5. A. have (     )6. A. foot (     )7. A. save (     )8. A. make (     )9. A. comes (     )10. A. When B. missing B. some B. how to B. to do B. want B. walking B. waste B. play B. dies B. Or C. find C. many C. what to C. doing C. take C. to walk C. use C. go C. meets C. How D. come back D. good D. when to D. did D. like D. walked D. have D. life D. plays D. Because