Ba bạn cần đi từ a đến B đường dài 22,5km trong hai giờ rưỡi mà chỉ bằng một chiếc xe đạp, xe chỉ chở được hai người. Biết rằng vận tốc đi bọ là 5 km/giờ, vạn tốc đi xe là 15km/giờ (cả lúc đi lẫn lúc đèo bạn). Hỏi họ có kịp đến B đúng hẹn không?

Tính nhẩm

6 + 4 + 5 = ...

Fill in each numbered blank with one suitable word or phrase.

Television first appeared some fifty years ago in the 1950s. Since then, it has been one of the most (1)_____ sources of entertainment for both the old and the young. Television offers (2)______ for children, world news, music and many other (3) _______. If someone is interested in sports, for example, he can just choose the right sports (4)______. There he can enjoy a broadcast of an international football match while it is actually happening. Television is also a very useful way for companies to advertise their products. It is not too hard for us to see why there is a TV set in almost every home today. And, engineers are developing interactive TV which allows communication (5) _______ viewers and producers.

Điền vào ô 4

If someone is interested in sports, for example, he can just choose the right sports (4)______. There he can enjoy a broadcast of an international football match while it is actually happening. 

A. athletes 

B. time 

C. studio 

D. channel