No one knows when exactly the lake _______________.

A. took its place    B. came into being   C. happened    D. came over

 Henry has been ill, but he is______ again now.

A. picking up    B. going up     C. drawing up   D. taking up

Thomas Huxley(English biologist,1825-1895) once_______ "Try to learn something about everything and everything about something"

A. put it       B. put out      C. put up with it    D. put in

We are _______ to talk loudly in the dormitory when others are taking a noon-break.

A. supposed    B. supposing    C. not supposed    D .not supposing

-Why does the river smell terrible?

--Because large quantities of water__________.

A. have polluted                   B. is being polluted

C. has been polluted        D. have been polluted

People were not allowed to enter the reading room because it          .

A．had been painted         B．was being painted

C．was painting                 D．painted

He will come to see you the moment he        his work.

A．will finish                     B．finishes                             

C．would finish                 D．had finished

—Hi, Tracy, you look tired.

 —I am tired. I _______the living room all day.

A. have been painting         B. had painted    C. painted       D. paint

I have no idea when the bus will arrive. I      for at least half an hour in such cold weather.

 A. had waited       B. have waited      

C. will wait        D. have been waiting

When I was at college I ______ three foreign languages, but I _____ all except a few words of each.

A. spoke; had forgotten                  B. spoke; have forgotten

C. had spoken; had forgotten         D. had spoken; have forgotten