Often he ________ sit for hours doing nothing at all in front of the computer.

[　　]

A．was used to

B．would

C．used to

D．should

Will you please ________ that all the children here are well fed end taken good care of?

[　　]

—The door makes a terrible noise.

—Yes. It ________ easily.

[　　]

—Can I help you?

—I'd like a room with a bath. How much do you ________?

[　　]

Only in this way ________ to make improvements in the operating system.

[　　]

—Why is Tom so upset?

—He didn't pass the IETS test though he ________ .

[　　]

We firmly believe that Chinese astronauts will sooner or later ________ on the moon.

[　　]

—Mary wanted to go to the party with you , but she's seriously ill .

—Then we'll go ________ her.

[　　]

She ought to stop working. She has a headache because she ________too long.

[　　]

Higher temperatures turning the ice sheet to water would cause ________ rise in sea levels worldwide and change ________ weather on earth.

[　　]