why are we always tired，do you know? Firstly if we cant sleep w 1 ，we will be tired．But we are often too b 2 ．we cant f 3 our work in the day and we must do it at n 4 ．we go to bed l 5 and get up e 6 ．so we cant sleep well．Most people need at 1east eight hours and some more．If we sleep for only five or six hours a night，we will be tired．Secondly，when we are ill we will be t 7 ．But we dont know we are ill．so if you are always tired，perhaps you are not so h 8 ．Youd better go to see a doctor．Thirdly，perhaps you cant eat some kinds of food like eggs，nuts，meat，chocolate or coffee．If you are ill and tired after eating some food，please dont eat it a 9 longer．But please eat more if you are well．At last，if the air around you isnt nice and clean，you will feel tired．So please open your w 10 often or go out for a walk and you will feel better．
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1.well2.busy 3.finish4.night5.1ate6.early7.tired8.healthy9.any10.window/windows
参考答案：
1.well2.busy 3.finish4.night5.1ate6.early7.tired8.healthy9.any10.window/windows