Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best completes each of the following exchanges.
Hoa is asking Hai, who is sitting at a corner of the room, seeming too shy.
- Hoa: "Why aren't you taking part in our activities? ___________________”
- Hai: "Yes, I can. Certainly."
A. Could you please show me how to get the nearest post office?
B. Shall I take your hat off?
C. Can you help me with this decoration?
D. Can I help you?