单项选择题

If you don't know the answer to this question, it is ______ to leave it blank and deal with the other items first.

A．valuable
B．advisable
C．considerable
D．probable
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单项选择题
All flights ______ because of the storm, they decided to take the train.
A．having cancelled
B．have been cancelled
C．were cancelled
D．having been cancelled
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This magazine can keep you ______ the latest development in the field of medicine.
A．be informed of
B．to inform of
C．informed of
D．informing of
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