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Why are we always tired，do you know? Firstly if we can’t sleep w____ (1)，we will be tired. But we are often too (2). We can't 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 can't sleep well. Most people need at least 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 don't know we are ill. So if you are always tired，perhaps you are not so h (8). You'd better go to see a doctor. Thirdly，perhaps you can't eat some kinds of food like eggs，nuts，meat，chocolate or coffee. If you are ill and tired after eating some food，please don't eat it a__ (9)longer. But please eat more if you are well. At last，if the air around you isn't 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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Travel is useful to us in at least three ways．
First, by t 1 we can enjoy the beautiful scenery(风景)of different place．We can see many which can be read about in books w 2 our eyes and v 3 some famous cities and interesting places．
S 4 , we will meet people with different interests and see strange and different things when we travel．We can get ideas of the conditions and customs(风俗)of o 5 people, taste different foods and local favors(偏爱)if we like．I 6 this way, we can understand how other different people live．
Third, travel will help us gain(获得)k 7 of geography and history , travel will also help us keep h 8 and strong．
With all these a 9 of travel, it is no wonder that travel has now become more p 10 than ever in China．