Complete the sentences with the present simple or present continuous form of the
verbs.
1. The difference engine (to be) a mechanical device that (carry) out a sequence of
computations specified by the setting of levers, gears and cams.
2. No, computer devices (begin) to change very rapidly.
3. We are now (witness) the development of fifth-generation systems.
4. Techniques of artificial intelligence (simulate) some aspects of human thought.
5. What languages expert systems (communicate) with users and programmers?
6. We (expect) to make extensive use of the artificial intelligence techniques in the
nearest future.
7. What the fourth-generation computes (rely) on?
8. We (live) in the digital age now.
9. What a computer (allow) you to do?