Television first (17)__________ about fifty years ago in the 1950s. Since then, it has been one of the most popular sources of (18)__________ for both the old and the young. Television can actually satisfy almost all kinds of (19)__________. It offers cartoons for children, world news, music and many other programs. If someone is (20)__________ in sports, for example, he can tune in to a sports channel. There he can enjoy a (21)__________ broadcast of in international football match. It is not so hard for us to see (22)__________ there is a TV set in almost every home today.