短文填空。(每空 2分，共 20分)
根据短文内容，在短文后的空格处填上一个恰当的词，使短文完整、通顺。
Someone says, "Time is money." But I think time is  important than money. Why? Because when money is spent, we can get it back. floweret, when time is it’ll never . That’s  we mustn’t waste time.
It goes without saying that the  is usually limited (有限的). Even a second is very important. We should make full use of our time to do  useful.
But it is a pity that there are a lot of people who do not know the  of time. They spent their limited time smoking, drinking and  . They do not know that wasting time means wasting part of their own . In a word, we should save time. We shouldn’t    today’s work for tomorrow. Remember we have no time to waste.