If they ______ what I was saying, they’d know what I was talking about.

With more forests being destroyed, huge quantities of good earth      each year.

— Have you watched the film “Avatar”? 
— Not yet. But I       the film is worth watching.

Tom is the only one of the students who     a scholarship since last year. 

Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.

They ________ to enter the building by the back door; however, the front door was locked.

It is said that the early European playing-cards ______ for entertainment and education.

I suppose by the time I come back next year, all these old houses south of the Baoshehe River ________ down.

What troubled the teacher was that no one present made an answer when asked who had broken the glasses, so he didn’t know who _____________.

—Tom, it seems that you haven’t cleaned your bedroom the whole week .
—You didn’t come in around 10 yesterday morning; I ________ it .