A postman delivers mail round a housing estate. He does not want to visit the same street more than once, but can pass over the same street corners. On which housing estate is this possible

A．It should be done because TV shows too much violence.
B．It is neither necessary nor possible.
C．It might not be workable, but we should not overlook the danger of TV.
D．It should be done as soon as possible.

A．They will feel pain all over.
B．They may think about killing themselves.
C．They will not go to school or work.
D．No one can help these people.