单项选择题

Don't ______. You'll cross the bridges when you come to them.

A． have worry
B． be worried
C． worry
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单项选择题
He usually gets up ______ 7 every morning.
A． at
B． about
C． on
单项选择题
Mrs. Peterson's house is ______ than all the other house in this area.
A． more big
B． bigger
C． biggest
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