Put the verb in active or passive

1. Communication and navigation equipment ______ in air traffic control system (use) 2. Two way communication between aircraft and ground _______ to provide a pilot with the necessary information. (reqiure) 3. Transmitter_______ information from one location to another (send) 4. Energy ______ by a transmitter in wave form. (radiate) 5. Navigation instruments _______ the pilot to control the aircraft (aid) 6. The wavelength range _______ into Long Waves, Medium Waves, Short Waves, Ultra–Short Waves.(divide) 7. In free space all radio waves ______in straight lines at the speed of light (propagate)

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