I. Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.Câu hỏi X: "I'm really excited. I'm going on holiday to Australia tomorrow." - Y: “ _____ ” A. Good luck! Do your best. B. Why don't you go home to bed? C. That's great. Have a good time. D. Cheer up! Things can't be that bad!