Television first ( 20 ) _________ some fifty years ago in the 1950s. Since then, it has been one of the most (21)__________ sources of entertainment for both the old and the young. Television offers cartoon for children, world new, music and many other programs. If someone is interesting in sports, for (22 ) __________ , he can just choose the right sports channel. There he can enjoy a broadcast of an international football match (23)_________ It is actually happening. Television is also a rery useful way for companies to advertise their products. It is not too hard for us to see why (24) _________ is a TV set in almost every home today. And, engineers are developing interactive TV (25) ___________ allows communication between viewers and producers 1 điểm 20/ A. appeared B. invented C. came D. happened 1 điểm 21/ A. cheap B. expensive C. popular D. impressive 1 điểm 22/ A. sure B. certain C. case D instance 1 điểm 23/ A. as B. so C. and D. or 1 điểm 24/ A. it B. this C. that D. there 1 điểm 25/ A. who B. which C. what D. it