单项选择题

We still know little about outer ______ though we have made much effort in research.

A．heaven
B．universe
C．space
D．sky
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单项选择题
______ the balcony, it could have saved me a lot of troubles.
A．Have I known
B．Had I known
C．I have known
D．I had known
单项选择题
It is not easy to learn English well but if you ______ , you will succeed in the end.
A．hang up
B．hang about
C．hang onto
D．hang on
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