单项选择题

Parents should______to prevent playground injures.

A．teach their children how to use the equipment
B．stop their children from climbing ladders
C．keep a watchful eye on their children
D．help maintain the equipment
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单项选择题
According to the schedule, the space shuttle will return to the earth on______.
A．Monday
B．Tuesday
C．Thursday
D．Friday
单项选择题
The speaker asked his friend to help himself to food and drink because______.
A．there were eggs and chicken in the fridge
B．his friend was good at cooking
C．his friend was very hungry
D．he would come home late
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