1. Our programmer [to write] a new computer program now. Do not disturb him!
2. I always [to use] a calculator to work out percentages.
3. The temperature remained constant while pressure [to change] in the experiment.
4. I [to delete] that whole file by mistake.
5. At the next seminar, we [to discuss] the difference between analog and digital computers.
6. Wait a little! The computer program [to search] the database. Bingo! We have a match.
7. A mouse [to have] a wire that [to connect] it with a computer.
8. My computer crashed when I [to write] my essay. I [to lose] all my work!
9. Just a moment! I [to print] a copy of the document for you.
10. Computer hacker [to be] someone who secretly [to use] or [to change] the information in other people's computer systems.
11. He [discuss] the bugs in software with his teacher when we came.
12. The program [not / to load]. What I [to do] wrong?