Passage Two Questions 29 to 31 are based on the passage you have just heard.

A．He lost a button at work.
B．He doesn’t know where he put the calculator.
C．He thought he broke something the woman lent him.
D．He’s not sure how to solve the math problem.

A．To mention other space programs.
B．To incorporate pictures into the paper.
C．To keep working on the original subject.
D．To search for information on the Internet.