Choose the best answer to complete the sentences.

1. Son Tung _____________ a project on energy source at present.

A. does

B.do

C.did

D. is doing

2.What should we do to _____________ water?

A. cut

B. take

C. save

D. waste

3.The problem with fossil fuels is that they are not _____________.

A. expensive

B. limited

C. renewable

D. non-renewable

4._____________ source of energy is the source that can't be replaced after use.

A. Renewable

B.Natural

C. Effective

D. non-renewable

5.We are looking for cheap, clean and _____________ sources of energy.

A. effective

B.efficient

C. serious

D. dangerous

6.We should put _____________ on our roof for the heating and hot water.

A. solar energy

B.equipment

C. cracks

D. solar panels

7.We should use _____________ light bulbs in our homes.

A. low energy

B.little energy

C. a bit energy

D. efficient

8. They______for a new energy source to replace coal now.

A. looked

B.are looking

C.look

D. looking

9.Do your parents _____________ coal as well as wood to make a fire for cooking?

A. burn

B. heat

C. reserve.

D. produce

10.Many countries in the world _____________ wind power on a commercial basis today.

A. used

B. will use

C. are using

D. uses

11.Now, automakers _____________ fuels cells that extract hydrogen from gasoline.

A. developed

B. develops

C. are developing

D. will develop

12.Now, humans _____________ on the sun and word for heat.

A. rely

B. relies

C. are relying

D. relied

13.Look! The students ______ soccer on the school yard .

A. is playing

B. are playing

C. will play

D. paly

15.Solar energy, air and water are _____________.

A. renewable

B. limited

C. restricted

D. narrow

16.Although nuclear power is clean and plentiful, it is not _____________.

A. dangerous

B. unsafe

C. safe

D. renewed

17._____________ energy sources include water and wind power.

A. Friendly environmental.               

B. Environmentally friendly

C. Friendly environment.       

B. Environmental friendly

18.Solar energy can be changed into _____________.

A. electricity

B. electric

C. electrician

D. electrical

19.They are tputting solar pannels on the roofs of our houses to produce_______energy.

A. air

B. solar

C. wind

D. water

20.We must _____________ the amount of water our family use every day.

A. lower

B. reduce        

C. listen

D. play