Part 2. Choose the correct answer (A, B, C or D) to complete the passage.

The television first (17) ______________ some fifty years ago in the 1950s. Since then, it (18) ______________ one of the most (19) ______________ sources of entertainment for both the old and the young. Television offers cartoons for children, world news, music and many other (20) ______________. If someone is interested in sports, for (21) ______________, he can just choose the right sport channel. There he can enjoy a broadcast of an international match (22) ______________ it is actually happening. Television is also a very useful way for comapnies to advertise their products. It is not too hard for us (23) ______________ why there is a TV set in almost every home today. And, engineers are developing interactive TV (24) ______________ allows communication between viewers and producers.