. --So hard __________ in the past few months that he has made great progress in English.
--I can see that, only a few mistakes he made in this exam.
A. he worked B. did he work
C. he has worked D. has he worked
--How often do you visit your grandparents in the village?
--I feel ashamed. __________.
A. Very often B. By accident
C. Every now and then D. All of a sudden
--Who has broken the window in my room?
--Who else _________ it but your naughty son!
A. could do B. could have done
C. should have done D. must have done
. The concert by Lang Lang was so well _________ that all the tickets had been _________ on the first three days last month.
A. received; sold out B. recognized; sold out
C. admitted; selling out D. taken; selling out
They _________ on the program for almost one week before I joined them, and now we are still working on it as no good results have come out so far.
A. have worked B. had worked
C. have been working D. had been working
--You look troubled.
--Father asked me to finish this task today. How can I _________ ？
A. manage to B. attampt to C. decide to D. happen to
