They failed to pass the exam last time; I regretted______.
A. to be not able to help them
B. being unable to help them
C. being not able to helping them
D. not be able to help them
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The study was conducted on a local scale and was independent ______ the central government.
A. on
B. against
C. from
D. of
Some people say the need for cars______by the year 2004.
A. will have doubled
B. had doubled
C. will be doubling
D. be doubled
I' 11______that I' m a qualified engineer.
A. have you know
B. have known you
C. have you knowing
D. have you known
He must have been ill, or he______to the lecture then.
A. would come
B. would have come
C. came
D. had come
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