Two analogies on manipulating items in a kitchen is given in the form "A : B. C : ?". The phrase "A : B" relates item A to its appropriate manipulation B. Your task is to replace the question mark (?) with the appropriate manipulation of item C, following the "A : B" relation. Your answer should be a verb which shows a way to manipulate the given object.
--------
Question: bag : open. letter : ?

Answer: open


Question: candy : unwrap. faucet : ?

Answer: turn


Question: walnut : shell. present : ?

Answer:
open