单项选择题

______ from space, our earth, with water covering 70% of its surface, appears as a "blue planet".

A．Seeing
B．To be seen
C．Seen
D．Having seen
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单项选择题
We must ______ a few items, or else we won't have enough money to pay.
A．shut out
B．get off
C．leave out
D．put off
单项选择题
In some societies ______ women work outside their homes, there exist many social problems.
A．where
B．which
C．what
D．that
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