单项选择题

Brushing your teeth regularly helps to ward ______ tooth decay.

A．down
B．against
C．off
D．away
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单项选择题
It is amazing that the habit Sam developed in his childhood still ______ him.
A．adds to
B．attends to
C．clings to
D．takes to
单项选择题
To my mind, his integrity is ______.
A．below a suspicion
B．above a suspicion
C．below suspicion
D．above suspicion
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