Only when （ ） in the afternoon （ ） able to leave.

The defense computers calculate way to （ ） the enemy missiles.

—Are you （ ）? —No, I’m serious.

Dinner will be ready _____. Let’s go and wash our hands.

The chemical factory was pulled down _____protecting the environment.

We consider_____the instrument be adjusted each time it is use

（ ） born in Chicago, the author is most famous for his stories about New York City.

I have bought _____ useful reference books _____ I don’t know which one to start with.

Her suggestion （ ） the class meeting be put off was turned down.

It’s too late to go out. _____， it’s going to rain.

The reason is （ ） he is unable to operate the machine.

Harmonious marriage, however, does not necessarily （ ） much sharing of interests and responsibilities.