补全对话。 Peter :Hello,Li Hua.You look so bad. ________________ Li Hua:_______________. I 'm worried about my English exam. Peter: Don't worry.Let me help you. __________________________ Li Hua:I have great difficulties in reading comprehension(阅读理解). The passages are usually difficult too long for me. Peter: ______________________________ Li Hua: Thank you so much. Peter:Good luck! Li Hua :____________________ A. Don't worry. Usually you can pay attention to the first and the last sentence of each paragraph to get the main idea. B. What's up ? C.What's the problem? D.Hello,Peter . E.Thank you .