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.
