数列$\left\{a_n\right\}$的首项为3，$\left\{b_n\right\}$ 为等差数列且$b_n=a_{n+1}-a_n(n\in N^{*})$ .若则$b_3=-2,b_{10}=12$，则$a_8=$（ ）

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注意：1）词数100左右；

2）可以适当增加细节，以使行文连贯。

Dear Sir/Madam,

    Yours,

    Li Hua

    Man began to make use of fire long long ago. Fire is useful in many ways, but sometimes it is dangerous. If you are not 1with it, it can burn things or even hurt you. A big fire can 2 forests and tall buildings. Sometimes a piece of thin paper can cause (引起)a big fire. So please remember not to smoke in the dry places like woods and forests. When you use candles at home, you should 3 your long hair away from the fire.

    But if there is a fire in our building, 4 should we do? Pour some water 5 your clothes. What's more, put a 6 towel (毛巾) over your mouth and your nose to keep the 7 out. You'd better run away from the fire as 8 as you can. But you mustn't rush! Or you may fall over and hurt yourself or others. Of course you should also call 9. On the phone you should clearly tell the firemen where the fire is to help them get there without difficulty. By the way, Do not 10 out of the window. Jumping may be more dangerous than the fire.

    Keep ourselves away from fire and safety is above all!