综合填空，根据首字母和汉语意思完成下列短文，注意用正确的形式填空。
Everyone has two eyes . Of course our eyes aren’t lonely. When you feel sad or you fail to meet _小题1:__ (某人), tears will come down from your eyes as __小题2:__ (像往常一样). When you are happy, __小题3:____（特别） when you laugh hard, tears will come down from your eyes,__ 小题4:_ . But tears have a more important job than showing your f__小题5:___ .
Tears keep your eyes clean and healthy. They wash away dirt and germs(细菌) just like bath. Your eyes also need tears to keep them w__小题6:_. And eyes must be wet so that they can move smoothly. Your eyes are busy looking here and there all day long. They move quickly from one thing to another. If you didn’t have tears, your eyes will have t___小题7:__ seeing something clearly, and soon you would be blind.
Tears is __小题8:___(有益的).Maybe you don’t like tears, but your eyes can’t do without them. As we know , foggy weather will do harm to our eyes, so we must protect our ___小题9:_____ (环境) from being polluted.
We are p__小题10:_ of our eyes.