－The window is dirty.

－I know. It ________ for weeks.

[　　]

More patients ________ in hospital this year than last year.

[　　]

These years I ________ to retire to earn more money.

[　　]

A．have been demanding

B．had been demanding

C．was demanding

D．demanded

Although Mary doesn't look ________, she ________ an active part in social activities.

[　　]

　　--The Chinese astronaut Yang Liwei is here already.

　　--I _____ he _____ until tomorrow.

[　　]

A．think; is coming

B．thought; would come

C．didn't think; was coming

D．don't think; will come

－How long ________ at this job?

－Since 1990.

[　　]

A．were you employed

B．have you been employed

C．had you been employed

D．will you be employed `

Anyone who wishes to devote himself to _____ the people should _____.

[　　]

A．serve; be praised　　　　　　B．serving; praise

C．serving for; be praised　　　　D．serving; be praised

Smith ________ for 2 years for political reasons when he was young.

[　　]

The managers discussed the plan that they would like to see ________ the next year.

[　　]

　　--Why didn't you buy the book?

　　--I _____ but I didn't have the money.

[　　]

A．would　　　　　　B．had had

C．would have　　　　D．had thought