Exercise 2. Rewrite the following sentences based on the given words. 1. Solar energy is cheaper and cleaner than coal. (more) 2. Scientists are trying to find cheap, clean and effective sources of energy for the future. (looking) 3. Carbon dioxide has a negative impact on the environment. (negatively) 4. Alternative sources of energy are plentiful. They are also clean and safe. (not only) 5. Wind and solar made up 10% of the world's electricity in 2019. (accounted) 6. It's a good idea to turn off the tap while brushing your teeth. (should) 7. Although nuclear power is dangerous, it can provide enough electricity for the world's needs for hundreds of years. (Despite)

 1. Solar energy is cheaper and than coal. (more) 

⇒ Coal is more expensive and dirtier than solar energy.

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2. Scientists are trying to find cheap, clean and effective sources of energy for the future.(looking) 

⇒ Scientist are looking for cheap, clean and effective sources of energy. (trying to find=looking for)

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 3. Carbon dioxide has a negative impact on the environment. (negatively) 

⇒ Carbon dioxide impacts negatively on the environment. (adj+N = V+adv) 

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 4. Alternative sources of energy are plentiful. They are also clean and safe. (not only) 

⇒ Alternative sources of energy are not only plentiful, they are also clean and safe.

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 5. Wind and solar made up 10% of the world's electricity in 2019. (accounted) 

⇒ Wind and solar accounted for 10% of the world's electricity in 2019. (made of = accounted for) 

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 6. It's a good idea to turn off the tap while brushing your teeth. (should) 

⇒ You should turn off the tap while brushing your teeth. (It's a good idea to = You should) 

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 7. Although nuclear power is dangerous, it can provide enough electricity for the world's needs for hundreds of years. (Despite) 

⇒ Despite being dangerous, nuclear power can provide enough electricity for the world's needs for hundreds of years. (Although + clause = Despite + Noun phrase)