It may not be a good idea. But before ____is put forward, we'll make do with it.
---What about _______ a rest? ---OK!Let’s go for a walk.
You should _______ in the dictionary when you meet a new word.
It’s a good idea _____ a pen friend to practise English.
How many ______ medicine are used for the children of six years old?
Eating fruit and vegetables can help you ______ more vitamins.