单项选择题

Bill was taking a lot of exercise to build up his ______.

A．ability
B．force
C．strength
D．mind
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单项选择题
Mary's bedroom is clean and clear, while her brother's bedroom is always ______.
A．at six and seven
B．at sixes and sevens
C．at sixth and seventh
D．at sixths and sevenths
单项选择题
______ that my head had cleared, my brain was also beginning to work much better.
A．For
B．Now
C．Since
D．So
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