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
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单项选择题
Some people enjoy sitting on the second floor of a big bus because ______.
[A] it is no danger
B. there are fewer people there
C. they can have a better view of the city
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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