reviewing for exam, need help!

I need help with this because I am too great at understanding shakespeare... =/ Just a few questions I need answered!

1. Both Aguecheek and Malvolio are easily taken by practical jokes. List and describe two similarities in their characters which make them easy to trick.

2. Why does Sir Toby believe he can act as he wishes in Olivia's house?

3. Compare and contrast Viola and Olivia, backgrounds, personalities, behaviors, etc.

4. Example of a pun, malapropism, and foreshadowing the play. And if you know the Act and scene that would be great =)

Hopefully I can get some help on here, I've tried looking for the answers but I'm having a lot of trouble. Thank you!