$1.$Why does a car eventually come to a stop when you take your foot off the gas pedal, according to Newton's first law? $$Because gravity pulls it to a stop.Because objects at rest tend to remain at rest.Because friction and air resistance act as forces to stop it$.$Because the car loses fuel.

$2.$ Why do interplanetary spacecraft need no fuel to keep going after they are launched into space? $$Because they are unaffected by friction and air resistance in space.Because they are immune to gravity.Because they have perpetual motion engines.Because they carry an infinite supply of fuel.

$3.$ Why don't passengers in a smoothly flying airplane feel any sensation of motion, according to Newton's first law? $$Because the airplane travels at variable speeds during the flight.Because passengers are heavily sedated during flights.Because the airplane is always at rest in the sky$.$Because no net force is acting on the airplane or the passengers.