辨别较复杂爆炸装置时我们通过观察爆炸物（ ）来辨明引爆方式

　Is there any bus service___at the airport?

　My wife is coming from Tokyo, but I forget her___（航班号）.

　The passenger who travels on an international flight should___.

　Baby service is available on most airlines but should be arranged___.

　A baby is defined by most airlines as a child___.

　The observation group traveled from south africa to oxford___eight other african countries.

　Is there any___flight that leaves on Sunday?

　You must pay___fare, because there is no discounts for this flight.

　Those planes are___for charter.

　They decided to train more maintenance engineers _____ aircraft.