阅读理解，根据短文内容判断句子正误。

John and Bob are in the same class. They are good friends. Last year they spent (度过) the summer holiday together. One day, they wanted to get up early to go fishing, but they didn't have an alarm clock (闹钟). "Oh, it's easy, I'll put some pieces of bread on the windows of the house, and they'll wake us up in the morning. " said Bob. John was surprised (吃惊). Early the next morning, some birds came down to eat the bread, and they woke John and Bob very quickly.