Question:
Goal: To hit a volley in tennis,

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS:
- approach the net and hit the ball back to the opponent from close to the net without letting the ball hit the ground.
- approach the net and hit the ball back to the opponent from close to the net after letting the ball hit the ground.
Answer:
approach the net and hit the ball back to the opponent from close to the net without letting the ball hit the ground.

Question:
Goal: To boost alertness and energy, you should take a nap for

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS:
- around four hours.
- around 20 minutes.
Answer:
around 20 minutes.

Question:
Goal: To make an invisible bookshelf.

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS:
- Attach brackets to the wall the length of the stack of books.
- Hang string along the wall the length of the stack of books.
Answer:
Attach brackets to the wall the length of the stack of books.