Questions 18～21 are based on the following dialogue between two friends talking about traveling. What is the Japanese population in San Francisco

A. Because he doesn’t earn very much money.
B. Because he has to work for quite a long time.
C. Because he doesn’t have time for lunch.
D. Because sometimes he has to work under bad weather.

A. There’s been nothing but rain for quite some time.
B. He’s bored with the changing weather.
C. He thinks that it’ll rain for three more weeks.
D. He’s bored about the topic on weather.