Fill in each gap with one suitable word: cell phones have been popular in Japan since the early 1990s, but it was not(1)............1999 that their use really took off. The age of cell phones has emerged, but with it come problems. Cell phones are used on buses and trains, in restaurants, and in all(2)........... of life. They cause problems when they(3).......... during meeting, concerts, wedding, or event funerals. What's more, people speak loudly in pubic, and students read and text messages during lessons. More seriously, when a cell phone is used near a person using a(4).......... to regulate his hearbeat, its radio waves may(5).......... with the functioning of the pacemaker, Now, something is being done to(6)........... these problems.In many places, new technology is being used to block phone calls.Airline(7).......... are requested to stop using cell phones while on board. Concerts halls ask their audience to switch their phone to the(8)......... mode. However, phone users fear that if they do not answer their phone, they will(9)............. valuable business opportunities. That's why many do not(10)........... off their phones even when they are asked to. giúp mình với nha các bnaj tks trước@@