单项选择题

When you go by bus in England,you must be careful because ______ .

A．you may go the wrong way
B．there are too many buses there
C．there are big buses with two floors
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单项选择题
People on foot can go across the road when ______ .
A．the traffic lights are green
B．they look to the right
C．the road is clear
单项选择题
What should you do if you are making changes to your house
A．Check 700 plans to build new buildings.
B．Think carefully about those living near yon.
C．Give enough details to the people next door.
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