Complete the sentences with the words and phrases in the box. There are two extra items.

biologist, text messages, update, discovery, gravity, web browser, computer science

0. To use some mobile devices, you need to put in a password.
1. I don't ____________ my profile very often because nothing really changes in my life.
2. There's something wrong with the _____________ I use and I can't get online.
3. I never use my mobile to call people, but I send lots of _________.
4. He's very interested in science so he went to university to become a ______________.
5. In your opinion, what was the greatest ______________ of the twentieth century?

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