Слова в скобках нужно вставить в нужном времени Fill in with Past Simple, Present Simple, Present Continuous or Present Perfect. She (carry) Whiskers to safety in her arms, when suddenly there was a huge explosion. The cat (leap) up into the air and (run) away. After an hour of fruitless search they still (not/find) him, so with heavy hearts they set off again for home. About two months passed. It was two o’clock in the morning and Rita (lie) awake in her bed in London. She (dream) about Whiskers. Suddenly she (hear) a strange scratching sound. Thinking it might be burglars, she (wake) Jim up and quietly they (creep) downstairs. They couldn’t tell where the noise (come) from. Then Jim opened the front door and, to their amazement, there was Whiskers! He (walk) for over 60 days, and incredibly he (find) his way home.

All the energy we receive , ultimately comes either from the sun or from the ground.
The sun heats our planet , and supplies required for plant growth light . And in the distant past the sun in the same way our planet has implemented energy. His energy is transformed into plants , animal life supported . Due to this we get today coal, oil and natural gas - the so-called fossil fuel resources on which our civilization depends significantly .
The only alternative energy source that is in the earth - the atoms of certain elements that formed long before the advent of the solar system. They are now in the crust * .
* Uranium contained in the earth's crust , formed about 6.5 billion years ago, and its concentration is on average 0.14 %. Heat from the radioactive decay of uranium today manages the processes of convection in the Earth's crust.
The amount of energy per unit mass of an atom depends upon the size of atom minimum amount of energy per unit mass of the atoms contained in the medium size ( such as carbon and oxygen) , while increasing the amount of the atoms contained in the small ( such as hydrogen ) or large ( such as uranium) . Energy can therefore be obtained either by joining smaller atoms atoms in average sizes (synthesis ) or by dividing the larger atom to medium size ( splitting). Development of fusion energy and humanity splitting energy is one of the most important achievements in the history .