A boy made a mess of the house. His mother said to him like this. 1Tidy up your things, or I'll throw them away! 2Tidy up your things, so that you can save a lot of time looking for things. 3Tidy up your things. If you can keep it for a week, I will reward you 50 yuan. 4Tidy up your things. Sun Xiaomei (the name of some girl he likes) likes neat boys best. Which one do you think is most effective? Give your reason.