单项选择题

If the straggle for a sustainable society______, we must have some vision of what we are aiming for.

A．is to succeed
B．has succeeded
C．succeeds
D．succeeded
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单项选择题
Several trial efforts in the 1980s proved that it was financially ______ to restore old buildings.
A．feasible
B．probable
C．beneficiary
D．passable
单项选择题
The editors said they must report to the world how Beijing has ______ pollution and improved the quality of the environment.
A．cut up
B．cut off
C．cut down
D．cut out
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