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
He gave the order that nothing（）until the police arrived.

A、 touched
B、 didn't touch
C、 be touched
D、 should touch
单项选择题
In the meantime, the question facing business is whether such research is（）the costs.

A、 worthy
B、 worth of
C、 worth
D、 worthwhile
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