This nationwide smog should serve as a reminder to all, indicating a high time that we ______ on what we've done to the environment.

After five hours’ drive, they reached _______ they thought was the place they had been dreaming of.

Tom was very angry about ________ to Mary’s birthday party.

I’d rather you ________ there next week.  

Mr. White _____ at 8:30 for the meeting, but he didn’t show up.

______ is the richest man in our city?

She was so angry and spoke so fast that none of us understood _____ she said meant.

This is a very interesting book. I’ll buy it, _____. 

—English has a large vocabulary, hasn’t it?
—Yes. _____ more words and expressions and you will find it easier to read and communicate. 

_____ for the free tickets, I would not have gone to the films so often.