TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: WATCH "ING" THE MOVIES 
Clue: In this 1983 film Eddie Murphy & Dan Aykroyd switch lives

SOLUTION: trading places

PROBLEM: Category: LEISURE ACTIVITIES 
Clue: In origami, folding paper down, away from you, is a mountain fold; folding it up toward you is this opposite

SOLUTION: a valley

PROBLEM: Category: LIFE OF PIE 
Clue: An old rhyme says that this "without some cheese is like a kiss without a squeeze"

SOLUTION:
apple pie