单项选择题

Birthdays axe such happy ______ when all your old friends can get together and have a good time.

A．days
B．occasions
C．cases
D．holidays
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单项选择题
Only when in danger ______ human beings.
A．snakes will most attack
B．most snakes will attack
C．will most snakes attack
D．will attack most snakes
单项选择题
80（）

A．hints
B．implications
C．clues
D．signs
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