Someone says, “Time is money.” But I think time is __1__ important than money. Why? Because when money is spent, we can get it back. However, when time is   2   it’ll never   3  . That’s   4   we mustn’t waste time.

  It goes without saying that the   5   is usually limited. Even a second is very important. We should make full use of our time to do   6__    useful.