Being a teacher always encouraging students to think for themselves, I won't tell them answers until they __________ on a math problem for more than an hour.
A．have workedB．will have worked
C．will have been workingD．had worked
The country life he was used to ____ greatly in the past decade． 
A．changeB．has changedC．changingD．have changed
I called him many times, but I didn’t get through, maybe his mum _   on the phone all the time．
A．talkedB．was talkingC．has talkedD．had talked
The London 2012 Olympic Games marks the third time that London ______ the right to host the modern Olympics.
A．had hadB．hasC．hadD．has had
--- How many concerts ____ up to now?
--- About 25. Last night we ____ our biggest one.
A．did you play, have had B．have you played, had
C．had you played, have had D．do you play, have had
I _____ all the cooking for my family, but recently I’ve been too busy to do it.
A．will doB．am doingC．doD．had done
China _______ rapid progress in space technology in the last 10 years.
A．madeB．has made
C．had madeD．were making
I called Hannah many times yesterday evening, but I couldn't get through. Her brother ______ on the phone all the time.
A．has been talkingB．was talkingC．has talkedD．talked
He asked me how much ________ on the mountain bike.
A．did I payB．I had spentC．did I spendD．I had cost
Her car has been very dirty. She has got to _______.
A．get washedB．washC．get washed itD．get it washed
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