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In the 18th century the Russian Government (1 — sent) Vitus Bering to explore the lands behind Russia. One day Bering (2 — discovered) the strait which (3 — separates) North America from Asia. It (4 — was named) after the discoverer. On a later voyage Bering (5 — saw) the mainland of North America. This discovery (6 — gave) Russia its right to Alaska. Bering (7 — had died) before he (8 — could) take the good news back to Russia. But Chirikov and some other men of Bering's expedition (9 — had come) back.
The Russians (10 — explored) the North American continent as far north as the Arctic Ocean. Others (11 — made) settlements or (12 — built) trading posts as far south as Northern California. Not long before G. Washington (13 — became) President of the US, the Russians (14— had made) a settlement in Alaska. For more than a hundred years trade (15 — was being carried) on between Russia and Alaska. During this time people from the US (16 — became) interested in this far northern territory. Some American ships (17 — sailed) to the Arctic Ocean to fish. Others (18 — were trading) with Russian settlements. In 1867 the USA (19 — bought) Alaska. It (20 — was sold) for a little more than seven million dollars.
Alaska (21 — is) the largest of all the states of the USA. It (22 — is) rich in minerals. There (23 — are) large forests, many animals and much fish there.

1. Many people had an opportunity to use computer.
2. There was no doubt that computers solved problems very quickly.
3. Instructions directed a computer.
4. Computers brought with them both economic and social changes.
5. computing embraced not only arithmetics but also computer literacy.
6. It was well known that computers prepared laboratory tests.
7. Those persons were computer literate and thought of buying a new computer.
8. They received a subscription magazine once a month.
9. My mother was ill and visited her doctor every other day.
10. Experts knew much about how to prepare programs.