根据对话内容，选择方框内选项填入空白处，使对话意思完整，通顺 (有一多余的)。 (Wang Junfeng and his parents are on their way to the airport. Michael is with them to see them off.) M: Junfeng, you are flying to Disneyland. 1______ W: Yes, I'm really excited. 2______ M: Don't be afraid. You can buy a guidebook, a tour in the U.S.A. W: 3______ I wish I wouldn't meet any difficulties. M: I hope so. Whenever you need help, 4______ W: Thank you for your help. I'm leaving soon. Bye, M: 5______ Bye. A. send me an e-mail or call me. B. Have a good trip. C. But I'm still worried about my English. D. Good idea. E. What's up? F. You must be excited.