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

A．My son has got a bad habit of smoking.

B．The old man always wears his blue hat.

C．He was standing by the gate waiting for her mother.

D．When she heard the news, she laughed happily.

填写句子：

（1 ）                                      ，载笑载言。

（2 ）淇水汤汤，                                      。

（3 ）总角之宴，                                      。

（4 ）                                    ，所思在远道。

（5 ）我有嘉宾  ，                                     。