A．The apartment was very dirty.
B．He had his old furniture cleaned.
C．He found an apart with a big yard.
D．The furniture was very inexpensive.

A．Aviation and Transportation Security Act was passed.
B．Ensuring the safety of passengers and aircraft became a major concern at airports.
C．Airport security became the responsibility of the federal government.
D．Security personnel required each passenger show photo identification before entering an aircraft.