50、公安边防检查站的主要任务是( )。

45、Airport fee is airport( )and( ) fee.

44、Security check usually consist of( ).

75、( )refers to goods prohibited by law or treaty from being imported or exported.

74、Can you put me on( )flight to Harbin?

73、All the flights before nine ( ) because of poor visibility this morning.

72、I’m ( ) to tell you that your flight has been delayed owing to mechanical difficulties.

13、——I forgot to carry my permit with me, would you please let me in?
——( ).

12、Restricted area is sometimes called( ).

11、Can you suggest me an alternate flight?
——( )

10、I’d like to( ) for the inconvenience caused by this delay.