题目内容：

完成句子

1.雨后，学生常常把雨伞落在学校里。

Students often _________ theirs umbrellas _________ school after rain.

2.在失物招领办公室常有两千部手机。

There are ________ ________ mobile phones in the ________ _______ office.

3.那就是为什么吉姆迟到。

_______ ________ Jim is late.

4.托尼正在找他的蜡笔。

Tony is ________ ________ his crayons.

5.首先，我有一个好消息要告诉你们。

________ ________ _______, I have good news to tell all of you.