题目内容：

阅读下列材料，在空白处填入适当的内容（一个单词）或括号内单词的正确形式。

A proverb says, “Time is money”. But in my opinion, time is even 1._____ precious than money. Why? 2._____ when money is spent, we can earn it back. However, when time is 3._______(go), it will never return.

4.______ is known to all that the time we can use is limited. Therefore we should make 5.___ use of our time to study hard so as to serve our country in6.____future.

But it is a pity that there are a lot of people 7.____ do not realize the value of time. They spend their precious time 8._____(play).

In a word, we should form the good habit of9._____(save) time. Do not put off what can be done today 10.___tomorrow.