补全对话（每题2分，共10分）
根据下面的对话情景，在空白处填上一个适当的句子，使对话的意义连贯、完整。
A: You look worried. ①______________?
B: Miss Gao told us to write a letter to our pen friends, ②______________.
A: Can’t you write a letter?
B: ③______________. But she told us to write in English. I’m weak in english. ④______________?
A: you can read the passage on Page 15 of our book. It’s a letter from an english girl. Read it again and again until you understand it.
B: But I don’t know how to use some English words.
A: ⑤______________. You can look them up in an English-Chinese dictionary.
B: You are right. Thank you very much.