从方框中选择合适的选项，补全对话。 A: Have you finished your homework? B: 1 Exercise Three is very difficult. A: Don't worry. I'll help you. B: 2 But I think I can do it myself.      Could you lend me your English-Chinese dictionary? A: 3 Here you are. B: Thanks a lot. Is Miss Gao in the office? A: Oh, no. She's out at the moment. B: Where is she? Do you know? 4 A:I think she's at the library. She told me she wanted to borrow some books. B: 5 A .Of course. B.Then I'll have to wait foe her. C.Not yet. D.It's very kind of you. E.I have some questions to ask her. 1. 2. 3. 4. 5.