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Exercise 11. Rewrite the following sentences using the words in brackets.
1. Wind energy is cheaper than natural gas. (more)
2. Scientists are trying to find cheap, clean and effective sources of energy for the future. (looking)
3. Carbon dioxide has a negative effect on the environment. (negatively)
4. Alternative sources of energy are abundant. They are also clean and safe. (not only)
5. Wind and solar accounted for 10% of the world's electricity in 2019. (made)
6. It's a good idea to leave the tap off while brushing your teeth. (shouldn't)
7. Although nuclear power is dangerous, it can provide enough electricity for the world's needs for
hundreds of years. (Despite)