____ you were busy, I wouldn’t have bothered you with questions.
A. If I realized
B. Had I realized
C. I realized
D. As I realized
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_____ your timely advice,I would never have known how to go about the work.
A. Unless
But for
C. Except for
D. Not for
He left orders that nothing _____ touched until the police arrived there.
A. should be
B. ought to be
C. must be
D. would be
Which of the following country is not a member of OECD()
A. Finland
B. Luxembourg
C. Vietnam
D. Italy.
It was recommended that passengers _____ smoke during the flight.
A. not
B. need not
C. could not
D. would not