[填空题].A flight attendant’s first and ( ) responsibility is the safety of the aircraft cabin and its ( ) .Flight attendants must comply with Federal Aviation Regulations/FARs//联邦航空条例/,which require flight attendants to be on aircraft for the sole purpose of performing safety related duties.However duties also include a wide ( )of passenger service functions.Flight attendants must be prepared for the unexpected and able to change from their passenger service role to their critical safety role at a moment’s notice.The flight attendant is the most highly visible employee to passengers of an aircraft.Flight attendants spend more time ( )passengers than any other airline employee,and attend to a wide variety of needs and requests.The flight attendant must offer the most ( ) service possible to each and every passenger for the duration of flights.