听第二篇短文，回答第16～20小题。
16. When did Mr and Mrs Black go to the cinema?
A. Yesterday afternoon.
B. This evening.
C. Yesterday evening.
17. How old was their son?
A. Two months old.
B. Eight months old.
C. Ten months old.
18. Who stopped them when they walked in?
A. A policeman.
B. An office worker.
C. A shopkeeper.
19. What did they think of the movie?
A. Interesting.
B. Relaxing.
C. Boring.
20. Why did they want to let their son cry?
A. To get all their money back.
B. To make him see the movie.
C. To give him something to eat.