Are you and Tom new students—Yes. new here.

What sort of house do you want to have? Something big?–Well, it ______ be big–that’s not important.

How amazing it is that astronauts are exploring outer space!-It’s a challenge, I guess, ______ man against nature

The air in Beijing is getting much ______ than a few years ago.

It was a meeting _________importance I did not realize at that time.