Нужно
1. Programming languages initially …. by people in universities ( create).
2. The experiment …. by testing the end product. (follow).
3. The students … their laboratory work now. (do)
4. Public interest in the electric vehicle … higher by now.(become).
5. Digital audio players … by rechargeable batteries.(power).
6. Last summer we … a plant producing digital televisions. (visit)
7. Space flights would be impossible if special materials for space vehicles ...(produce).
8. If I … you , I'd try to replace a heat sink. (be).
9. If you … image editing software, it would be easier to preserve your family memories.(install)
10. If you want your confidential information stays confidential, … a firewall. (install).
1) were created
2) is followed
3) are doing
4) became
5) are powered
6) visited
7) weren’t produced
8) were
9) had installed
10) install
Не факт, что всё верно, но ни у кого ничего другого нет