Question:
Goal: How can I get my trash can clean outside?

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
Use the garden hose to spray down the inside of the can and put some soap in first if extra dirty.

Question:
Goal: How to make a page-holder protruding outside the book, without using any other materials?

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
Tear the top corner of the page a little bit and place it so that it sticks outside the book when closed.

Question:
Goal: how do you bend something?

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
fold it.