Question

(阅读下列短文，掌握其大意，在空格填入一个符合逻辑的正确单词形式，使短文内容完整)

Why are we always tired, do you know? Firstly if we can’t sleep well, we will be tired. But we are often too (1) . We can’t finish our work in the day and we (2) do it at night. We go to bed late and get up (3) . So we can’t sleep well. Most people need at least eight hours and some (4) . If we sleep for only five or six hours a night, we will be tired.

Secondly (5) we are ill we will be tired. But we don’t know we are ill. So if you are always tired, maybe you are not so (6) . You’d better go to see a (7) .

Thirdly, maybe you can’t eat some kinds of food like eggs, nuts, meat, chocolate or coffee. If you are ill and tired after (8) some food, please don’t eat it again to see if you are well.

At last, if the air (9) you isn’t nice and clean, you will feel tired. So please open your (10) often or go out for a walk and you will feel better.

Answer 1

答案：