氨气是一种重要的化工产品，工业上可以按照下图所示流程生产氨气：

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Dear Amy,

   I want to 1 your friend. Let me introduce my family to you. My father is a doctor. He is tall 2 strong. My mother is a teacher. She is think and kind. My brother Sam is 6 years old. He's short and funny. We 3 in a big city. However, we usually go 4 on the weekends. I have a small and nice room. There is a bed and a desk in my room. I like reading books. I have many books 5 my desk. Welcome to my home.

                                                                                                                                                                        Yours,

                                                                                                                                                                          Lucy