单项选择题

Every means _______ been tried to solve the difficult problem.

A．have
B．has
C．is
D．are
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单项选择题
The explorers sailed on the ocean for two weeks and ________ found the mysterious land.
A．generally
B．eventually
C．extremely
D．gradually
单项选择题
Our long-term goals mean a lot _______.
A．if we cannot reach solid short-term goals
B．if we complete the short-term goals
C．if we have dreams of the future
D．if we put forward some plans
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