阅读短文，从方框中选择适当的动词，并用其适当形式填空。有的需要加助动词或不定式符号（每词限用一次）。

learn; make; know; hold; show

More and more research 【小题1】 that exercise not only helps the body, but also helps the brain. Besides, doing sports helps kids to make friends. Mark, a sports fan, started to play football when he was six years old. He used to be shy and weak, but now he has become taller and stronger. He gets 【小题2】 the importance of communicating with his teammates and could 【小题3】 from mistakes and failure. He 【小题4】 lots of friends with the same interest recently. These days, lots of football training 【小题5】 on the playground. They have more to talk about and enjoy the happiness after training.