单项选择题

The opening ceremony is a great occasion. It is essential ______ for that.

A．for us to be prepared
B．that we are prepared
C．of us to be prepared
D．our being prepared
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单项选择题
During the reading lesson, the teacher asked students to read a few ______ from the novel.
A．pieces
B．essays
C．fragments
D．confirms
单项选择题
The ______ family in Chinese cities now spends more money on housing than before.
A．normal
B．average
C．usual
D．general
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