以下标有题号的每一行均有一个错误，请找出，并改正。

My parents and I went to the zoo on last Sunday.     1.              

There were a lot of visitors stood in front of the   2._______________

ticket window. We waited for a long time and buy three      3.              

tickets in the Monkey Mountain World of the zoo. I was     4.              

too eager to see the smart and funny animals, but I     5.              

quickened my steps through the crowd. Unfortunate,    6.              

I got separated from my parents. I had hard time looking     7.              

for him. But no luck. Wandering in the zoo, I felt    8.              

alone without companions. Worse still, I had no money,      9.              

so I had to walk home, covered as much as 10 miles.    10.