Поставьте глаголы в скобках в simple past либо present perfect:1. Since

Поставьте глаголы в скобках в simple past либо present perfect:
1. Since computers were first introduced to the public in the early 1980"s, technology (change) a great deal.
2. The first computers (be) simple machines designed for basic tasks.
3. They (have,not) much memory and they (be,not) very powerful.
4. Early computers were often quite expensive and customers often (pay) thousands of dollars for machines which actually (do) very little.
5. Most computers (be) separate, individual machines used mostly as expensive typewriters of for playing games.
6. Times (change). Computers (become) powerful machines with very practical applications.
7. Programmers (create) a lot of useful programs which do everything from teaching foreign languages to bookkeeping.
8. We are still playing video games, but todays games (become) faster and more interesting.
9. Many computer users (get, also) on the Internet and (begin) communicating with other computer users around the world.