Which of the following animals lives only in water?
The air in Beijing is getting much ______ now than a few years ago.
The students asked Mr. Wang ______ them some advice on reading.
— What’s the news in today’s newspaper?— ______ special. Let’s go out for a walk.
You ______ do it if you really don’t want to.
When you’re learning English, just use it, ______ you’ll lose it.