3. Make sentences.

1. My home hasn't installed a solar water heater. If/ my home/ install/ a solar water heater/ wel save a lot of energy.

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1. Noise pollution/ any loud sounds/ either harmful or annoying/ humans and animals.

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2. Generally/ noise produced/ household appliances/ big trucks/ vehicles and motorbikes/ on the road/ planes

helicopters flying over cities/ loud speakers, ets.

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3. A large number of people ride their motorbikes to work. If/people/ ride/ bikes/they/ keep/ air/less polluted.

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4. That factory doesn't have a wastewater treatment system. If/ that factory/ havel wastewater treatments river/ not become so polluted.

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V. Read the following passage, then choose a word from the box and write the correct word next to numbers 1-5. There is one exemple.

   Solar energy is a long lasting source (0)..of.. energy, and it can be used almost anywhere. To generate solar energy, we only need solar cells and (1).....................! Solar cells can easily be installed on house (2) ................., so we don’t need any new space. Compared to other (3)...................... sources, they also possess many advantages: wind and water power rely on turbines which (4).................noisy, expensive and which take up large space. Solar cells are totally silent and (5).......................... As they have no moving parts, they require little maintenance and have a long lifetime.

Question 1

V. Read the following passage, then choose a word from the box and write the correct word next to numbers 1-5. There is one exemple.

   Solar energy is a long lasting source (0)..of.. energy, and it can be used almost anywhere. To generate solar energy, we only need solar cells and (1).....................! Solar cells can easily be installed on house (2) ................., so we don’t need any new space. Compared to other (3)...................... sources, they also possess many advantages: wind and water power rely on turbines which (4).................noisy, expensive and which take up large space. Solar cells are totally silent and (5).......................... As they have no moving parts, they require little maintenance and have a long lifetime.

Question 2

Based on the context, make conditional sentences type 2 from the clues.

1. My home hasn't installed a solar water heater. If/ my home/ install/ a solar water heater/ we/ save a lot of energy.

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2. Not all households in Viet Nam turn off lights during the Earth Hour. If/ all households/ Viet Nam/ turn off lights/ the Earth Hour/ we/ save enough electricity/ develop our rural areas.

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3. Some students in our school still throw litter on the school ground. If/ students/ our school/ not throw litter/ the school ground/ our campus/ look/ greener/ fresher.

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4. People use aluminum cans instead of glass bottles. If/ people/ use/ glass bottles/ they/ use/ again and again.

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5. Our school ground is large but we don't have a wind turbine. If/ we/ install/ a wind turbine/ our school/ become/ more eco-friendly.

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6. People don't use organic fertilizers. If/ people/ use/ organic fertilizers/ they/ prevent/ land pollution.

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7. A large number of people ride their motorbikes to work. If/ people/ ride/ bikes/ they/ keep/ air/ less polluted.

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8. That factory doesn't have a wastewater treatment system. If/ that factory/ have/ wastewater treatment system/ river/ not become/ so polluted.

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Solar energy is a long lasting source of energy which can be used almost anywhere. To generate solar energy, we only need solar cells and the sun. Solar cells can easily be installed on house roofs, so nonew space is needed and each user can quietly generate their own energy. Compared to other renewable sources, they also possess many advantages: wind and water power relies on turbines which are noisy, expensive and easy to break down. Solar cells are totally silent and non-polluting. As they have no moving parts, they require little maintenance and have a long lifetime.

However, solar energy also has some disadvantages. We can only generate solar energy during daytime because the system depends on sunlight. Besides, solar cellsrequire large area to work effectively. The main disadvantage of solar energy is that it costs about twice as much as traditional sources such as coal, oil and gas. This is because solar cells are expensive. Scientists are hoping that the costs of solar cells will reduce as more and more people see the advantages of this environmentally friendly source of energy.

1.   What is the main topic of the passage?

A.  Advantages and disadvantages of solar energy.

B.  Solar energy as an alternative for fossil fuels.

C.  Solar energy’s advantage over other sources of energy.

D.  The cost of solar energy.

2.   What does the word “they” refer to?

A.  solar cells   B. solar energy users

C. other renewable resources    D. advantages

3.   Which of the following is the advantage of solar cells?

A.  They are non-polluting.

B.  They operate quietly.

C.  They require little maintenance.

D.  All are correct.

4.   According to the passage, what is traditional source of energy?

A.  sunlight      B. electricity       C. coal   D. water

5.   The main disadvantage of solar energy is       .

A.  expensive

B.  difficult

C.  unconvenient

D.  unfriendly

Solar energy is a long lasting source of energy which can be used almost anywhere. To generate solar energy, we only need solar cells and the sun! Solar cells can easily be installed on house roofs, so no new space is needed and each user can quietly generate their own energy. Compared to other renewable sources, they also possess many advantages. Wind and water power rely on turbines which are noisy, expensive and easy to break down. Solar cells are totally silent and non-polluting. As they have no moving parts, they require little maintenance and have a long lifetime. However, solar energy also has some disadvantages. We can only generate solar energy during daytime because the system depends on sunlight. Besides, solar cells require large area to work effectively. The main disadvantage of solar energy is that it costs about twice as much as traditional sources such as coal, oil and gas. This is because solar cells are expensive. Scientists are hoping that the costs of solar cells will reduce as more and more people see the advantages of this environmentally friendly source of energy

40. What does the word advantages in line 13 mean?

A. very bad B. resources C. benefits D. friendly

read the following passage,then choose a word from the box and write the correct word next to numbers 1-5.There is one exemple

roofs garden non-polluting polluting

the moon are renewable the sun

solar energy is a long lasting source (0) of energy,and it can be used almost anywhere,To generate solar energy ,we only need solar cells and (1) Solar cells can easily be installed on house (2) ,so we don't need any new space.Compared to other (3) sources,they also possess many advantage wind and water power rely on turbines which(4) noisy,expensive and which take up large space.Solar cells are totally silent and(5) As they have no moving parts,they require little maintenance and have a long lifetime