阅读下面短文，根据以下提示（1）括号内汉语提示；（2）该词首字母提示；（3）上下文语境提示，在每个空格内填入一个适当的英语单词，使短文通顺，所填单词要求拼写正确，形式符合英语表达习惯。（10分）

It is important for us to have a good mood in our daily life.

If you own a good mood, you will find everything around is ________(精彩) 76 ________in the world. M______ importantly, you will have an optimistic effect77 ______________ people about you. Certainly, we will live a harmonious and happy78 ________life. It is also good for your own h________. However, sometimes when you79 ________meet some ________(困难), when you quarrel with some others or when you80 ________________(失败) in doing something, you may have a terrible mood. If so, you81 ________should get _______of such a bad mood as soon as possible.82 ________ ______ is known to all, every coin has its two sides. So you should 83 ________think more about the b________ side. We are sure that everything will be all84 ________right with time p________ by. Remember—only you can make yourself feel85 ________happy.

I hope that everyone has an excellent mood every day!

为了测定黄铜（铜、锌合金）的组成，某研究性学习小组称取该样品10g，向其中逐滴加入9.8%的稀硫酸至刚好不再产生气体为止．反应过程中生成的气体与所用硫酸溶液的质量关系如右图所示．试计算：

（1）样品中铜的质量分数；

（2）反应所消耗的硫酸溶液质量；

（3）反应后所得溶液的溶质的质量分数．