1) Drones can sometimes ___ to airplanes if they fly too close. a) authorised b) pose a threat c) appliances 2) Strange lights in the sky are often reported as ___. a) onboard b) unidentified objects c) hover 3) The police are responsible for maintaining ___ during big events. a) public safety b) rotor c) malicious intent 4) The army protects the country’s ___ from foreign attacks. a) cause concern b) national security c) comeback 5) Only ___ drones are allowed to fly near airports. a) authorised b) nimble c) artificial 6) The investigators found no evidence of ___ behind the flights. a) malicious intent b) appliances c) rotor 7) News about unidentified drones can ___ among local people. a) cause concern b) surveillance c) pilotless 8) Some drones are ___ and don’t need a human pilot. a) peak b) pilotless c) included 9) A drone can ___ in one place in the air. a) hover b) authorised c) devices 10) Modern drones are very ___, with many different applications. a) versatile b) malicious c) man-made 11) Drones are controlled ___, often with a smartphone. a) remotely b) national security c) comeback 12) Each drone has a ___ with blades attached to a motor. a) rotor b) cause concern c) appliance 13) A ___ is a device with blades used to move ships or aircraft. a) propeller b) surveillance c) unidentified 14) Many drones have cameras ___ so pilots can see from a distance. a) onboard b) nimble c) artificial 15) Citizens worry that drones may be used for constant ___. a) hover b) surveillance c) authorised 16) Boston Dynamics built a robot that is small and ___. a) malicious intent b) nimble c) public safety 17) Smart speakers are examples of home ___. a) appliances b) rotors c) national security 18) Virtual Reality has made a big ___ in recent years. a) public safety b) comeback c) pilotless 19) Some technologies are ___, not natural. a) artificial b) appliances c) hover 20) VR is still not at its ___. a) peak b) rotor c) sighting

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