Complete these sentences with the correct form of the verb: infinitive or -ing form.

1. Don't switch off without (close down) your PC.

2. I want to (upgrade) my computer.

3. He can't get used to (log on) with a password.

4. You can find information on the Internet by (use) a search engine.

5. He objected to (pay) expensive telephone calls for Internet access.

6. He tried to (hack into) the system without (know) the password.

7. You needn't learn how to (program) in HTML before (design) web pages.

8. I look forward to (input) data by voice instead of (use) a keyboard