阅读下面材料，在空白处填入1个适当的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? Because when money   2  (be) spent, we can earn it back. However, when time   3  (go), it will never return.
It is known to all that the time we can use is   4 (limit). Therefore we should make use of our time more __5__ (full) to study hard so as to serve our country in   6  future. But it is a pity that there are a lot of __7__(person) who do not realize the value of time. They spend their precious time smoking,   8 (drink) and playing.
In a word, we should form a good habit of   9  (save) time. Do not put off what can be done today __10__ tomorrow.