题目内容：

请阅读 Mary 写给 Dr. Know 的一封信。

Dear Dr. Know,

I am busy and unhappy these days. Classes begin at 7:00 every morning and I have to get up at 5:30 because my home is very far from my school. It takes me an hour to get to school by bike. So I'm sleepy in class every day. Dogs are very cute. And I want to keep a dog as a pet. But my mom doesn’t think dogs are good pets for us because we don't have enough time to walk a dog every day.

Spring comes and it is warm and sunny. I want to go out to exercise every day, but my mom says study is the most important thing in my life. How terrible!

What are you doing now? What's the weather like in your city? Are you happy every day?

Mary

假如你是 Dr. Know，根据 Mary 的来信给她写一封回信，回答 Mary 信中提出的问题，并就她的烦恼给出建议。

要求：1.语言流畅，字迹工整。

2．80 词左右。

3. 不得出现真实姓名和学校。

Dear Mary,

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Yours,

Dr. Know