若a^m+1b³和（n-1）a²b³与是同类项，且它们合并后结果是0，则(    )

﹣4，﹣|﹣ $\frac{4}{3}$  |，0， $\frac{22}{7}$ ， $\frac{\pi }{2}$ ，2013，﹣（+5），+1.88，0.010010001…，﹣2.33…．

整数集合{       }

非负数集合{       }

分数集合{       }

无理数集合{       }．

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 Tom,

    How is everything going recently? That has been a long time since we meet in China last time. Having passed the finally exams, I am busy planning a two-weeks trip to the US during this summer holiday. Do you have any suggestions about the choice of America cities? I prefer big and modern cities. I guess I'd better to book a hotel. What is the price for single boy like myself? Is it easy to find Chinese food? What is the traffic like, after I travel between cities in the US? Hope to hearing from you. Thank you!

    Best regards!

Li Hua