Fill in the gap: Complete the following sentence with the words that fits best in the sentence.
1. The aircraft hadn't got diplomatic _________to land in Mexico.2. He raised his binoculars to ______ the coast.
3. NAV lights provide the _________ of showing which direction the plane is flying.
4. The _______ light are always turned on prior to the engine start.
5. '' Uhm, Mission control there seems to be a flock of geese on the ________, and we can't land!''.