Questions 19 to 22 are based on the conversation you have just heard.

A. He doesn’t have anything to do.
B. He believes she is wrong about the pick-up time.
C. Before lunch is a great time to pick up the document.
D. Time passes very quickly.

A. The plane is safe even if two of its engines fail.
B. There are three engines on each of the giant jet plane.
C. There is an extra engine on each of the giant jet plane.
D. The engines never fail on the giant jet plane.