Questão de Inglês

A FLIGHT ANNOUNCEMENT 'Good evening, ladies and gentlemen. On behalf of British Island Airways, Captain Massey and his crew welcome you on board the Start Herald Flight to Southampton. Our flight time will be approximately forty-five minutes, and we shall be .................... to an altitude of eight thousand feet and cruising at a speed of two hundred and fifty miles per hour.' (from M. Underwood and P. Barr Listeners) Select the alternative to complete correctly the paragraph.