sentence: A website address is typed in. sentence:  Skateboards skate and do tricks down stairs and on benches throughout a city. sentence:  A skateboarder rides a concrete ramp in a skate park. sentence:  Skateboarders ride the banks of a drainage ditch. sentence:  Different skateboarders ride in a concrete ramp doing tricks. sentence:  The city lights are seen at night with passing traffic in fast motion.