what is a group of this animal called: Pony?

Questions

Literature : Dr. Seuss wrote this book: The Cat in the______.?

Literature : Edgar Allen Poe wrote a famous poem about his animal.?

Literature : From which Shakespeare play is this line taken: Double, double?

Literature : From which Shakespeare play is this line taken: Goodnight, goodnight! parting is such sweet sorrow, That I should say goodnight till it be morrow.?

Literature : From which Shakespeare play is this line taken: To be or not to?