A. your son will enjoy playing with itB. I'll take oneC. I don't know which one is the best for himA: Good morning, sir. What can I do for you?B: Yes, please. I am leaving America soon. I want to buy an American toy for my son ashis birthday present, but【D4】______ .A: How old is your son? B: Four years old.A. This is a "Panda Trucker". It is an electric toy. I think【D5】______ .B: Show me how it works, please.A: It's very simple. Put two batteries into this box, then turn on the switch, and the panda will drive the truck. B: What an interesting toy it is!【D6】______ . I'm sure my son will be delighted. Here's the money. Thank you for your suggestion. A: You are welcome. Wish you a pleasant journey.