I won't tell the student the answer to the math problem until he ________ on it for more than an hour．

A．has been working

B．will have worked

C．will have been working

D．isn't working

The hero's story ________ differently in the newspapers．

A．was reported

B．was reporting

C．reports

D．reported

Susan decided not to work on the program at home because she didn't want her parents to know what she ________．

A．has done

B．had done

C．was doing

D．is doing

－Where did you put the car keys?

－Oh, I ________ I put them on the chair because the phone rang as I ________ in．

A．remembered; come

B．remembered; was coming

C．remember; come

D．remember; was coming

The manager had fallen asleep where he ________, without undressing．

A．was laying

B．was lying

C．had laid

D．had lied

－What's wrong with the coat?

－Just now when I wanted to get off the bus, the man next to me ________ on it．

A．sat

B．had sat

C．had been sitting

D．was sitting

The water ________ cool when I jumped into the pool for morning exercise．

A．was felt

B．is felt

C．felt

D．feels

More than a dozen students in that school ________ abroad to study last year．

A．sent

B．were sent

C．had sent

D．had been sent

I ________ in London for many years, but I've never regretted my final decision to move back to China．

A．lived

B．was living

C．have lived

D．had lived

________ with such great difficulty, Jack felt at a loss ________．

A．Facing; what to say

B．Faced; what to say

C．Having faced; how to say

D．Being faced; how to say