А
То be - was, were - been;
to have - had - had;
to mean - meant - meant;
to learn - learned/learnt - learned/learnt;
to become-became-become;
to bring-brought-brought;
to know-knew-known;
to think-thought-thought;
to buy-bought-bought;
to pay-paid-paid;
to take-took-taken;
to do-did-done;
to begin-began-begun;
to give-gave-given;
to make-made-made;
to keep-kept-kept;
to get-got-got;
to read-read-read;
to show-showed-shown, showed.
Б
1. Many people had an opportunity to use computers.
2. There was no doubt that computers solved problems very quickly.
3. Instructions directed the operation of 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.
Here is a map showing how the panda habitats for many years. The largest area - an area where one could meet pandas about a million years ago.
The territory is less - the one where the pandas were 2,000 years ago.
Now you can see how little room is left for the life of pandas today.
Panda population is steadily declining. At present, China's bamboo groves lives only 1,000 giant pandas! and for the preservation of this species in China has established 12 large reserves. The fact that pandas are very vulnerable. This is due to their natural diet. He's at 99 percent is made up of bamboo, and the three hundred species of this plant panda eats only 10-15. For bamboo characteristic regular mass extinction in the vast territories. Bamboo live 40 to 80 years, then blooms, gives seeds and dies, all plants of this species at the same time - the whole bamboo forest.
