单项选择题

The psychologist picked several students ______ and said that they were highly intelligent and would achieve great success.

A．by accident
B．at random
C．on occasion
D．by chance
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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
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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