The word “non-essential” in the second sentence can be best replaced by __________.

Mark the letter A, B, C, or D on your answer sheet to indicate the word that has the underlined part pronounced differently from the others.

Mark the letter A, B, C, or D on your answer sheet to indicate the word that has the underlined part pronounced differently from the others.

Choose the word whose stress is put differently from that of the others.

Choose the word whose stress is put differently from that of the others.

Choose the best answer to complete the sentence.

It is stated that we are now in the first stages of a battle for the __________of life on the Earth.

Choose the best answer to complete the sentence.

To stop global warming we have to use _______ energy like solar and wind.