There are different forms of energy (1)_____ heat energy, sound energy, light energy, electric energy and so on.

Energy can be transformed from one into another in different ways. For example, electric energy becomes (2)_____ energy in the radio set or become light energy in the TV set. But energy can neither be finished off nor be produced. 

It is important for us to make use of energy. Expanding gases can be used to run a machine or to make airplane (4)_____ in the air. Heat from the sun and water power can be controlled. And atomic energy can be used to do many things. We are now doing our best in making use of energy in our (5)_____ construction.

Câu 1: A. like B. such as C. such D. as

Câu 2: A. light B. sound C. atomic D. heat

Câu 3: A. preservation B. Conservation C. protection D. formation

Câu 4: A. fly B. to fly C. flying D. flies

Câu 5: A. national B. nationalize C. nation D. nationally