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
. After the earthquake, the Haitian（海地的）people needed to be helped _________.
A. occasionally B. anxiously C. practically D. urgently
There is no _________ that the Chinese people will present to the world a successful, splendid and unforgettable exposition（博览会）.
A. belief B. doubt C. possibility D. need
It’s certain that holding such _________ National Day parade will significantly improve _________ national pride and self - confidence of the Chinese People.
A. the; the B. a; a C. a; the D. the; a
We _________ last night, but we went to the concert instead.
A. must have tudied B. might study
C. should have studied D. would study
