阅读短文，根据短文内容和所给出的首字母，在空白处填入适当的单词，将完整的单词写在短文后面的横线上。
When Mike was walking through the town, he noticed a stranger man. The stranger looked at him with a big frown(皱眉)and it made Mike very uncomfortable. Mike did nothing w_____71___ , but the man still frowned at him. He was so angry that he frowned at the man with his tongue(舌) out. And he found most of the people around looked unhappy and frowned. Mike wondered w____72____ so many people frowned at each other.
A clever idea came into Mike’s head. He should s____73____ first. It seemed silly at first, but he want to h_____74___ a try. When a woman walked towards him, he smiled a___75___ her and the lady smiled at him, and most of the people smiled at him, too. Everybody seemed happy b______76_____ of the smile of the clever boy.
Then Mike once again met the stranger and the man still looked at him w____77___ a frown. Mike had a good idea. He smiled a big smile w___78___ the man passed him. The man stopped, looking at Mike’s face and he started to smile. The two strangers laughed and they b_____79_____ felt happy. Just a smile lifts you up f____80____ a feeling of down. So when you see a man with a frown, put a smile on your face. And you’ll find that the world is a happy place.
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