219. I received a postal packet yesterday. Which of the following can replace the underlined word? _____
Now even the middle school students go abroad for study ___.
This dictionary is very useful. It has ___ many problems about works and idioms for me.
It's foolish to go to the ___ of taking music lessons if you never practise.
He is delighted to have ___ the examination.
I wasn’t ___ the decision until too late.