Circle the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
21. A: “Do you think we can use driverless car in bad weather?”
B: “__________”
A. No, I don’t care.B. Let me think.
C. No, I don’t think it will be pleasant.D. Yes, that’s a good idea.
22. A: “Have you heard of bullet trains?”
B: “__________”
A. No, I don’t care. B. Sometimes, I travel by bullet train.
C. Yes, I‘ve heard several times. D. Yes, that’s a good idea.