----- Nội dung dịch tự động từ ảnh ----- Mark the letter A, B, C, or D indicate the sentence that best completes each of the following exchanges. 21. The students are discussing a plan to protect the environment. - Jack: "How about planting more trees in the school yard?" -Bill: . A. I'm afraid you're right C. Sorry. That sounds good. 22. Two friends are talking to each other. - Lan: "What a beautiful dress you have!" A. It's very nice of you to say so. C. That's a good idea. B. I'm sorry. It's a good idea. D. Great! Let's do that. Hoa: B. It's my pleasure D. How come?