单选题 You are seated in ____ 30, seat B.

单选题 There are many reasons for a flight ____.

单选题 The passengers ____ at Montreal.

单选题 He doesn’t want to ____ in political affairs.

单选题 You must pay___fare, because there is no discount for this flight.

单选题 Who is the author of Birdflight as the Basis of Aviation?

单选题 Who is the first person flying across the English Channel?

单选题 The ____ of an airplane is the pilot in charge of it.