Task 4. Complete the text with the Past Simple Passive form of the verbs in brackets. Modern text messages, or SMS, were invented (invent) in 1992. Early messages 1 (not write) on a mobile phone, they could only be sent from a computer to a phone. The first message in the UK said "Merry Christmas". In 1993, the first mobile-to-mobile SMS service 2 (introduce) in Sweden. It wasn't popular immediately, but by 2011, an average of 17.9 billion texts 3 (send) every day. However, technology always moves forward, and in the same year, SMS messages 4 (replace)as the most popular way of sending texts. Chat apps, such as WhatsApp. 5 (use) to send 19 billion texts a day. Experts think this number is going to double in thе next two years.​