增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1).每处错误及其修改均仅限一词；

2).只允许修改10处，多者（从第11处起）不计分。

Dear Li Hua,

    I am honored that you would ask me for some advices. As you know, our band was formed in a very unusual way. However, we learned a lot about be a band since then.

    First, you should think careful about what kind of music you want to write and play. You had better play one kind of music if you want to become famous. Next, you can come up to a name for your band—something which is different. Then, make a special time for practicing but stick to it. I will also need to give several performances for friends and family to get their ideas on your musical ability.

    Above all, just have a fun. I believe it will be an amazed experience for you.

Yours Sincerely,

Freddy

如图所示，用滑轮组把一个物体匀速拉起，不计摩擦，则下列 说法中正确的是（  ）

已知函数f（x）=$\left\{\begin{array}{c}\left(2-x\right)·\left|x-1\right|,0\le x<2\\ 1,x=2\end{array}\right.$，其中x表示不超过x的最大整数，如，﹣3•5=﹣4，1•2=1，设n∈N^*，定义函数f_n（x）为：f₁（x）=f（x），且f_n（x）=ff_n﹣1（x）（n≥2），有以下说法：

①函数y=$\sqrt{x-f\left(x\right)}$的定义域为{x|$\frac{2}{3}$≤x≤2}；

②设集合A={0，1，2}，B={x|f₃（x）=x，x∈A}，则A=B；

③f₂₀₁₅（$\frac{8}{9}$）+f₂₀₁₆（$\frac{8}{9}$）=$\frac{13}{9}$；

④若集合M={x|f₁₂（x）=x，x∈0，2}，则M中至少包含有8个元素．

其中说法正确的个数是（　　）