Which of the following underlined parts is different in pronunciation from others?

A．He acts as a killer in the film.

B．When did you arrive at the airport?

C．Can you help me fix the chair?

D．What did you think of the final exam?

按顺序排列句子，写出序号。

（　　）我把钢笔交给了老师。

（　　）我感到很高兴。

（　　）我在校门口拾到了一枝钢笔。

（　　）到了学校，我问同学们是谁丢的。

（　　）老师在班会上表扬了我。

（　　）同学们都说他们没有丢。