Answer:
Don't be a greedy monkey and don't steal?
The error in verb voice would be C
Your answer would be “The most memorable trip was when my brother and I encountered a bear.”
C.) Usually used for wartime efforts to pull a certain crowd together.
Yours blanks will be filled as followed,
1st Blank - Hannibal
2nd Blank - army
3rd Blank - war
4th Blank - Alps