What does the sign mean?

 

Choose the correct answer.

Solar energy is ______ than fossil fuels.

Find the mistake in the following sentence.

We should using more renewable energy to protect the environment.

Choose the word that is OPPOSITE in meaning to the underlined one.

Biogas is abundant and cheap for cooking and heating.

Choose the correct answer.

Fossil fuels are cheap, ______ they cause pollution.

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Coal is harmful to the environment, ______ it is still used in many countries.

Choose the correct answer.

People are now trying to lead a greener way of life by using _______ coal and oil.

Choose the correct response.

Oliver: “What is a disadvantage of wind power?”

Cady: “_______”