IV. Read the passage. Then decide which option best fits each blank. (1.5 pts) The mobile phone has become a very important (21)____________ in our life today.It is not just to ring other people, it is used for texting (22)______________, photos and videos and for (23)_____________ as well. In recent years, with smart phones, people can do a lot more things, such as reading newspapers, joining (24)______________ media, and of course playing games. A real mobile phone call was first made (25)____________ 1973. The handheld device used for this call weighed 1,1 kg. Its talk time was just half an hour. Nowadays, however, mobile phones have become much smaller, and of course they allow us to talk much (26)______________. 21. tool device machine program 22. messages lessons songs poems 23. writing watching singing chatting 24 sociable society social socialise 25. on of in over 26. shorter fatter bigger longer giúp em bài này với ạ