根据所给汉语注释或题干信患，在答题卷上标有题号的横线上，写出空缺处各单词的正确形式。每空只限一词。
He was wearing a very   (严肃的)expression and I knew something was wrong.
Everybody should   (积极)join in this charity to raise money for the poor.
It is my father's   （四十）birthday this weekend.
Nowadays the people's living conditions in the countryside have   （改善）a lot.
I felt the   (温暖)of my mother's arms around me.
My cousin was busy （回复）to his pen friend when I came to visit him.
Three plus three （等于）six
Every time you answer a question  ,you will get a point.
-Smoking does   to health. Please give it up, Dad!
-OK, I will. I cough a lot recently.
- Do you know how much the ring is  ？
-I have no idea, but I think you can afford it.