A、They can not be stopped. B、They didn’t roll at all. C、They are too ugly. D、They may hurt others. A短文中提到，默林引起了众多人的注意力，但是唯一的问题是他

Today, roller skating is easy and fun. But a long time ago, it wasn’t easy at all. Before 1750, the idea of skating didn’t exist. That changed because of a man named Joseph Merlin.(29)Merlin’s work was making musical instruments. In his spare time he liked to play the violin.(30)Merlin was a man of ideas and dreams who was called a dreamer by the people.
    One day Merlin received an invitation to attend a fancy dress ball. He was very pleased and a little excited. As the day of the party came near, Merlin began to think how to make a grand entrance at the party. (31)He had an idea and thought he would get a lot of attention if he could skate into the room. Merlin tried different ways to make himself roll. Finally, he decided to put two wheels under each shoe. These were the first roller skates. Merlin was very proud of his invention and dreamed of arriving at the party on wheels while playing the violin. On the night of the party Merlin rolled into the room playing his violin and everyone was astonished to see him.(32)There was just one problem that Merlin had no way to stop his roller skates. He rolled on and on. Suddenly, he ran into a huge mirror that was hanging on the wall. Down fell the mirror, breaking to pieces. Nobody forgot Merlin’s grand entrance for a long time!
29. What did Joseph Merlin do according to the passage?
30. Why did people think Merlin was a dreamer?
31. How did Merlin make a grand entrance at the party?
32. What was the only problem of Merlin’s roller skates?