单项选择题

_________is known to all, good friends add happiness and value to each other's life.

A．Like
B．Since
C．As
D．Though
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单项选择题
The actor and actress provided superb interpretations of their ___________ roles.
A．respectful
B．respective
C．respecting
D．respected
单项选择题
The basic causes are unknown though certain conditions that may lead to cancer have been__________.
A．identified
B．guaranteed
C．notified
D．conveyed
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