小测验：选择正确的单词

1. She spent the weekend profitably.
   她的周末过得很有益.
2. They invested the money very profitably.
   他们的投资大有赚头.
3. We must see that our spare time is profitably occupied.
   我们要使业余时间得到有效的利用。
4. We can very profitably quote from that book.
   我们可以从那本书中引录到非常有用的内容。
5. To put to good use;use profitably.
   善用很好地利用;获利地使用

　1个副词解释