How many bike messengers are there who send packages in New York

A．By accident.
B．By applying for this job.
C．By the chance his brother offered to him.
D．By winning the cycling contest.

A．Many of them could have been in jail before.
B．They don't have to register.
C．Their social security numbers must be checked in order to be employed.
D．Their personal records are seldom checke