Read the text and complete it with the correct form of the verbs in brackets:

1. Have you ever wondered what life would be like if we did not have mobile phones? 2. If you take a few minutes to think about it, you will realize just how much some people depend on them. 3. Many of us get frustrated if we cannot phone our friends when we wanted to. 4. Teenagers wouldn’t be able to contact their parents if they knew they were going to be late home, and drivers would not be able to get help quickly if they had a bad accident. 5. But are mobile phones really so necessary? If you turn yours off for the rest of the day, would your life really become so impossible? Try it and see!