4. Transform the word in capitals and fill the sentence with it.

Решение:

1. The weather in Britain is changeable.
2. It's very cold and frost in North America in winter.
3. K.Tsiolkovsky was the greatest researcher in space area.
4. Tornadoes are very dangerous.
5. Russian have made a lot of valuable inventions.

Ответ: 1. changeable, 2. frost, 3. researcher, 4. dangerous, 5. science.