Air pollution is getting _______ serious in big cities in the world.

You are under no obligation    ______ to accept this offer.

There's a lot more to Willie than one would think: still waters run _______.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

"Why don't you have your room repainted?" said Robert to Lan.

The Wildlife Fund helps to _______ endangered species.

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.