Ⅰ.语法填空
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。
I'm sure you know from your own experiences that laughter brings people together.Humor helps to solve difficult situations.It makes you more 1.________ (charm) and others more entertained.It 2.________ (reduce) stress.I've even read research up to now 3.________ says laughter makes our internal organs work better!
