【正确答案】Dear Zhao,
Thank you for the job you have offered me, but now I find that the job is not quite suitable to me because it makes me tired everyday from time to time. When I get home at seven o'clock, I have to do much housework and baby-sit my little son. After doing that, it always takes me four hours. It makes me exhausted. I have no time to do other thingssuch as reading books, watching TV, playing computer and so on. What's more, I have only two days-off every month.So I have to give it up. I am sorry.
Thank you for your time and attention.
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　yours,
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Li Ming