Lee is new in Yangzhou. Maybe he needs a _____for sightseeing.                        

下列特称命题中真命题的个数是(  )

①  $\exists x\in R,x\le 0$②至少有一个整数，它既不是合数，也不是素数

③ $\exists x\in${x|x是无理数}，x²是无理数

孟宪实教授说：“在中国历史上，唐朝是最有魅力的一个朝代”它的建立者是（    ）

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限一词。

2）只允许修改10处，多者（从第11处起）不计分。

    Last Sunday afternoon I went to a park by bike. I was walking in the park while a couple asked me if I could help take some photos of me. I was more than willingly to offer my service. With many thank, they waved goodbye to me. Therefore, a few minutes later, I found they had been dropped a black handbag on the bench where they had sat. Believe they would return, I decided to wait for them with the handbag on my hand. Soon, they hurried back and I returned the handbag to them, for that they thanked me again and again. What great pleasure it was to help others out!