题目内容：

语法填空。阅读下面材料，在空白处填入适当内容(不多于3个单词)或括号内单词的正确形式。

A lecturer was giving a lecture to his students on stress management. He raised a glass of water and asked the audience, “How heavy do you think this glass of water is?” The students’ answers ranged from 20g to 500g. It doesn’t matter on the absolute__1.___ (weigh). It depends on how long you hold___2.___. If I hold it for a minute, it is OK. If I hold it for an hour, I'll have___3.___ache in my right arm. If I hold it for a day, you will have to call an ambulance. It's the exact same weight, but the____4.__ (long) I hold it, the heavier it becomes. If we carry our burdens__5.___the time, sooner or later, we won't be able to carry on, the burden__6._(become) increasingly heavier. What you’ve to do is to put the glass down, rest for a while before holding it up again. We have to put down the burden periodically, so that we can__7.__(refresh) and are able to carry on.

__8.__you return home from work tonight, put the burden of work___9.__.Don't carry it back home. You can pick it up tomorrow. Whatever burdens you’re having now on your shoulders, let it down_10._a moment if you can. Life is short, enjoy it!