4. Complete the sentences

1. In the language of science energy is the ability..........................................................

2. Energy is needed for all our.......................................................................................

3. If somebody is very active, we might say that he is..................................................

4. Food, oil, petrol, gas and electric batteries all produce.............................................

6. We have to use energy from other sources, such as...................................................

7. The chemical energy in food changes in our bodies..................................................

8. If we run, the chemical energy changes to..............................................................

9. When energy changes from one form to another, some of the energy....................

…………………………………………………………………………………………

IV. Analyze

1 . Match the words with their Russian equivalents

1 alive	a альтернативный
2 to supply	b сохранение
3 conservation	c глюкоза
4 uselessness	d в точности
5 alternative	e бодрый, энергичный
6 exactly	f однако
7 glucose	g cнабжать
8 to store	h наука
9 however	i бесполезность
10 science	j сохранять, хранить

2. Give the English equivalents

наука……………………………………………………………………………………

в точности……………………………………………………………………………...

бесполезность…………………………………………………………………………

снабжать……………………………………………………………………………….

глюкоза…………………………………………………………………………………

хранить, сохранять…………………………………………………………………...

бодрый…………………………………………………………………………………

однако………………………………………………………………………………….

альтернативный……………………………………………………………………….

ни... ни………………………………………………………………………………….

сохранение……………………………………………………………………………..

деятельность…………………………………………………………………………...

3. Put the words in the correct word order

1. to / is / work / ability / energy / the / do / .

2. can / different / energy / in / we / forms / store / .

3. Sun / largest / our / is / the / energy / source / .

4. form / is / energy / changing / from / always / one / another / to / .

5. use / we / activities / energy / can't / solar / many / of / our / for / .

6. of / total / same / amount / the / energy / the / remains / .

7. when / changes / from / to / one / another / form / some / of / wasted / the / energy/ is / energy / .

8. need / to / sources / of / find / alternative / energy / we / ways / using / .

4. Prove the following statements

1. Energy is needed for all our activities.

2. Energy is always changing from one form to another.

3. We need to find ways of using alternative energy sources.

5. Match the words with their English definitions

1 activity	something that you can choose instead of something else
2 cost	the act or process of providing something that is needed
3 to enable	the careful use of energy, water, and other resources, so that they are not wasted or lost
4 alive	keep something for future use
5 alternative	a person who has a lot of energy and is very active
6 energetic	a simple sugar which is an important energy source in living organisms
7 conservation	require the payment of a specified sum of money before it can be acquired or done:
8 glucose	something that someone does in order to achieve an aim
9 to supply	to give someone the ability or opportunity to do something
10 to store	living and not dead