阅读下面短文并用英语回答问题（请注意每小题后面的词数要求）。

Mr. Dawson was an old man with a bad temper(脾气). And everyone in town knew it. Kids were afraid to go into his yard to pick apples.

One Friday 12-year-old Janet and her friend Amy had to walk past Mr. Dawson’s house. When Janet saw him she suggested crossing the street to the other side. But Amy said they needn’t.

When Mr. Dawson saw Amy he smiled and said “Hello Amy! I see you have a new friend with you today.” Amy smiled back and told him that Janet would stay with her that night. Mr. Dawson looked friendly and gave them each a fresh apple. The girls were glad to get them.

Later Janet asked Amy “Everyone says he is the most unwelcome person in town. Why was he so kind to us?” Amy explained that when she first walked past his house she was also afraid of him. But she pretended(假装) there was an invisible (看不见的) smile on his face and so she always smiled back at him. It took a long time but one day he half-smiled back at her and then started talking to her.

“An invisible smile?” Janet was puzzled. “Yes ” answered Amy “My grandma told me to think so. She says smiles can run around. If we keep smiling at someone sooner or later he will really smile back.” 

Remember what Amy’s grandma said and we will find that most people can’t refuse our smile.

1. What did people feel about Mr. Dawson? 

2. Who did Amy learn “an invisible smile” from? 

3. What does the writer want to tell us?