阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

Hello, everyone,

　　Now I’d like to talk about our performances at school.

　　First, we should be optimistic 61．_______ our future, 62．_______ is of great importance to us. Only when we believe in ourselves can we have a 63．_______ (creation) mind.

　　Second, manage the spare time well. Don’t depend on our parents 64．______ (arrange) it. We should keep in mind 65．_______ valuable time is.

　　Third, if we have trouble with our classmates, we should get the teacher or parents 66．_______ (inform) of what has happened. Nothing can take 67．_______ place of their help.

　　Fourth, our study may be 68．_______ (exhaust), but we should hold on. Just concentrate on our lessons 69．_______ we will feel relaxed more or less．

　　I hope every one of us can study and live 70．_______ (positive)．

　　That’s all. Thank you.