The mobile phone has been around since the 1970s, but the idea behind the text message (1) ___ developed until the 1980s. Then, years later, the first text message (2) ___ sent in the UK in 1992. When people started to use mobile phones, text messages (3) ___ used very often. Now, millions of text messages (4) ___ sent every day. People like text messages because they (6) ___ cheap. So, a lot of money (7) ___ spent to send them.