He ________ for three hours.

[　　]

In her room I saw that only a fire ________ there.

[　　]

They will be here soon, ________ let’s have coffee.

[　　]

The examinations are ________ hand.

[　　]

It is generally believed that teaching is ________ it is a science.

[　　]

A computer can only do ________ you have instructed it to do.

[　　]

The office is empty. They ________ to the meeting hall.

[　　]

How pleased the detective was ________ what his customer told him!

[　　]

I need some red ink badly, but there’s ________ at hand.

[　　]

________, the players began the game.

[　　]

A．Having taken our seats

B．After we had taken our seats

C．Being taken the seats

D．Taking the seats