By the end of this year Mr. Smith ______ in our company for exactly three years.

I wish they ________ in their ball game.

Would you please pass me the book _______ cover is black?

Is there any hope of __________the final exam?

Laptops are now so expensive ________ beyond the reach of almost everyone.

Training astronauts ________ not an easy thing.

She didn＇t go to the party last night, _________ she had to finish her term paper.

Tom ought not to ___me your secret, but he really meant no harm.

To know what is good and _______ are two different things.

The clothes a person wears may express his ________ or social position.

You can＇t drink alcohol ________ you are at least eighteen years old in some states of the US.