Robinson crusoe. вставьте пропущенные слова.

I. Since computers were first introduced to the public in the early
1980's. technology (has changed) a great deal.
2. The first computers (were) simple machines designed for bacic
tasks.
3. They (did not have) much memory and they (were not) very powerful.
4. Early computers were often quite expensive and customers otten
(paid) thousands of dollars for machines which actually (did ) very little.
5. Most computers (were) separate, individual machines used mostly
as expensive typewriters or for playing games.
6. Times (have changed). Computers (have become) powerful machines with
very practical applications.
7. Programmers (have created) a lot of useful programs which do every-
thing from teaching foreign languages to bookkeeping.
8. We are still playing video games, but today's games (have become)
faster and more interesting.
9. Many computer users (have also got) on the lntemet and (begun)
communicating with other computer users around the world.

1 The train (had not arrived) yet, but a lot of people (were already waiting) on the platform.
2 Hardly had the car (gained) speed when a police oficer (stopped) it.
3 She was absolutely happy. Since she (changed) her job her salary (had doubled).
4 She got up from the chair on which she (had been sitting) and (followed) the guests into the garden.
5 He was glad to have such an assistant. Since he (worked) with John he
(had respected) his business qualites.
6 When we (got) that strange leter we (had been thinking) long what to do
with it untl we (decided) to ask Father’s advice.
7 We were happy to see them. We (had not often met) since they
(moved) to a new neighborhood.
8 No sooner had Tom  (finished) the conversaton than the messenger
  (came) with a delivery.
9 She (breathed) heavily because she (had been running) all the way.
10 Afer the war (was) over he (returned) to his natve town and
  (lived) there until there (came) the news about a new war.
11 Is that you, Stella? What (have you been doing) all this time?
12 Helen  (had done) her chores and  (was relaxing) with a cup of cofee
when her boyfriend (called) and (invited) her to the cinema.