阅读填空 根据下面短文内容，在短文的空格处填上一个恰当的词．使短文完整、通顺。
Our eyes are very important to us. They are like cameras. We can see beautiful things and colors around us.
 our eyes. But if we don't take care of them, they may
hurt.    do we protect our eyes?
On sunny days, the sun shines brightly. So we'd better
     our sunglasses. When we read, we shouldn't stay
too close to our books and the light shouldn't be too bright    too dark. We mustn't read in bed. It’s    for our eyes. We mustn't rub our eyes with dirty hands or play games on computer too long.