Complete the sentences:

• 1 Internet users need to have antivirus software to protect their computers.
• 2 My email account is penguin_7, which isn't my real name of course.
• 3 Jenny doesn't have an email account, so I can't send her the information she needs.
• 4 Google has been the most popular search engine since 2010 and 91% of all Internet users prefer it.
• 5 Telegram is a very popular social network for people to send and read short messages.