填空题
What are freeways?
They are wide highways ______.
填空题
When do the freeways get very crowded?
During ______.
填空题
How can a large vehicle block the lanes?
When it ______ or overturns.
填空题
What has been done to have fewer cars on the freeways?
Asking several people to ______.
填空题
What privilege can these people enjoy?
______ of the freeway is reserved for them.