阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Adam is a freshman at senior high school. 【小题1】 (go) from junior high school to senior high school is a really big challenge to him. So the first week was a little 【小题2】 (confuse) to him. When he tried to join the school football team, the coach refused him. However, he didn’t lose hope. He’ll find a way 【小题3】 (improve) by himself so that he can join the team next year. He knows he’ll have to study 【小题4】 (hard) as a senior high school student and get used to being responsible 【小题5】 a lot more.