Fill the prepositions and adverbs in the explanation.

Most of us listen to the radio ... , but have you ever wondered how the sounds get to us ... the radio station? When the announcers speak or play music, the sounds flow ... through the air on radio waves. These waves can pass ... solid objects. They also travel very ... so we hear them almost ... as the antennas on our radios pick up the signal. Radio waves can transmit conversations, music, pictures and other information ... millions of kilometers. They can even transmit signals through outer space.