Lesson 6 背景知识听力填空[音频]When the departing aircraft has approached the________of active runway, the ground controller will _____ it to the _________. On receiving the pilot’s request for takeoff, the tower controller will look down the runway to determine whether the runway is __________to use. The tower controller will give the pilot _______ only when _______ has been achieved between aircraft. Once the aircraft _________, the tower controller will continue to watch the airplane and monitor its________ until this aircraft is ________ to the controller in the next control unit. When the aircraft approaches the ________, the approach controller hands it over to the tower controller. If conditions permit, the tower controller__________ to the pilot. When the aircraft has landed, the tower controller directs the pilot to ___________ and change to the _________.