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
