阅读下面短文，按照句子结构的语法性和上下文连贯的要求，然后从所给的A、B、C和D项中，选出最佳选项。
Dads work hard every day. Father's Day is the time for us to say “thank you”to our dads.
The idea for Father's Day started 11909. A woman called Sonora Dodd thought about 2a Father's Day holiday when she was listening to a Mother's Day speech at church. She wanted a special day to honour her father, William Smart. Mr Smart's wife died when she was giving birth to 3sixth child. He raised the baby and his4five children5 a farm.
When she became 6adult, Sonora Dodd understood how kind her father was. When he was raising his six children7, he worked very 8to make sure his children grow up 9.
Since 1966, the third Sunday in June has become a national Father's Day in10. In early times, people wore red roses 11respect for fathers who were still living and white flowers for fathers who had died. Today, people all over the world celebrate(庆祝) Father's Day 12many different ways. Some people buy their fathers something useful.Some people just do some simple things that they can do 13preparing a cup of tea or making some nice food for them. However the holiday is celebrated, the idea is for children to let their father 14that he is loved.
15 give your father a surprise by saying “Thank you”on the coming Father's Day?
