通读下面和短文，然后在后面所给的四个选英中，选出一个最佳答案．

　Bill and Fred were students at a university (大学) and they were friends. They didn't have　　 　1 　, so when it was time 　2 　their holidays, Bill said,“Let's take our holidays in a trailer (拖车), Fred. It's cheaper than a hotel. I can 　3 　my father's trailer. ”Fred was very happy, so they got into the trailer to begin their 　4 　.

　They wanted to get up 　5 　to go fishing, but they didn't have an alarm clock (闹钟).

　“That's all right, Bill,” Fred said. “I'll put these small pieces of bread 　6 　the top of the trailer tonight and they'll 　7 　in the morning.”

　Bill was very 　8 　, but he didn't say anything.

　Fred was right. 　9 　the day broke, small birds came down to eat the bread, and their　　 　10 　woke up Bill and Fred very quickly.