单项选择题

______, you'd better keep it away from kids.

A．To be safe
B．being safe
C．That for safe
D．As be safe
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单项选择题
Not only did Franz know her, ______ he was also her classmate.
A．and
B．also
C．but
D．or
单项选择题
Courage, intelligence, and experience all ______ overcome obstacles.
A．helps
B．helping
C．help
D．helped
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