Lesson 5: Practice
Practice Activity
The topic sentences are missing from this short essay. Pause the video, read the essay and fill in the gaps with the appropriate topic sentences. When you finish, start the video to see if your answers are correct.
Instructions: Match These Topic Sentences with the Correct Sentences Below.
- An additional technique is to use the movement of the ocean tides to generate power.
- One alternative which is already widely used is nuclear power.
- All things considered, the need to develop alternative energy sources is of vital importance.
- Another alternative source of energy is solar power.
Practice Essay
Coal is a non-renewable resource. This means that once it has been used up, it is gone forever. The use of coal is also environmentally harmful. Consequently, the development of alternative sources of energy is very important.
- ____ A single power station of this type can satisfy the energy needs of a whole city and doesn’t pollute the air. However, it does produce radioactive waste which is difficult to dispose of.
- ____ It is a very low-cost source of energy, therefore more and more countries have started using the sun’s energy to produce electricity.
- ____ Incoming and outgoing tides can turn huge pieces of machinery to create electricity. As a result, the forces of nature are used to provide a clean, renewable source of energy.
- ____ There are some promising techniques already in use, but more research needs to be done before we can stop being dependent on fossil fuels.
Coal is a non-renewable resource. This means that once it has been used up, it is gone forever. The use of coal is also environmentally harmful. Consequently, the development of alternative sources of energy is very important.
(2) One alternative which is already widely used is nuclear power. A single power station of this type can satisfy the energy needs of a whole city and doesn’t pollute the air. However, it does produce radioactive waste which is difficult to dispose of.
(4) Another alternative source of energy is solar power. It is a very low-cost source of energy, therefore more and more countries have started using the sun’s energy to produce electricity.
(1) An additional technique is to use the movement of the ocean tides to generate power. Incoming and outgoing tides can turn huge pieces of machinery to create electricity. As a result, the forces of nature are used to provide a clean, renewable source of energy.
(3) All things considered, the need to develop alternative energy sources is of vital importance. There are some promising techniques already in use, but more research needs to be done before we can stop being dependent on fossil fuels.