单项选择题

All flights ______ because of the storm, they decided to take the train.

A．having canceled
B．were canceled
C．having been canceled
D．have been canceled
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单项选择题
The government has promised to do ______ lies in its power to ease the hardships of the victims in the flood-stricken area.
A．however
B．whichever
C．whatever
D．wherever
单项选择题
A man has to make ______ for his old age by putting aside enough money to live on when old.
A．supply
B．assurance
C．provision
D．adjustment
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