词语运用
阅读短文，从方框中选择适当的词并用其正确形式填空，使短文通顺、意思完整。请将答案写在下面题号后的横线上。每空限填一词，每词限用一次。

finish，  late,   sleep,   like,  eat, health,  window,  clean,  good,  need

Why are we always tired, do you know?
First, if we can’t sleep   , we will be tired. But we are often too busy. We can’t     our work in the day and we must do it at night. We go to bed    and get up early. So we can’t sleep well. Most people   at least eight hours and some even more to sleep. If we  for only five or six hours at night, we will be tired.
Secondly, when we are ill, we will be tired. But we don’t know we are ill. So if you are always tired, perhaps you are not so   . You should go to see a doctor.
Thirdly, perhaps you can’t eat some kind of food    eggs, nuts, meat, or chocolate. If you are ill and tired after eating some food, please stopthem to see if you are well.
At last, if the air around you isn’t nice and , you will feel tired. So open the    often or go out for a walk and you will feel better.