Food is very important.Everyone needs to __21__ well if he or she wants to have a strong body.Our minds also need a kind of food.This kind of food is __22__.We begin to get knowledge even __23__ we are very young.Small children are __24__ in everything around them.They learn __25__ while they are watching and listening.When they are getting older， they begin to __26__ story books， science books…， anything they like.When they find something new， they love to ask questions and __27__ to find out answers.What is the best __28__ to get knowledge？ If we learn by ourselves， we will get __29__ knowledge.If we are __30__ getting answers from others and do not ask why， we will never learn well.When we study in the right way， we will learn more and understand better.