单项选择题

They usually ______ hello to each other when they meet togehter.

A．tell
B．speak
C．say
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单项选择题
The number of the students in our class______ thirty-five.
A．are
B．is
C．be
单项选择题
She forgot ______ her exercise again.
A．to do
B．doing
C．do
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