Mark the letter A, B, C or D to indicate the correct answer to each of the following question.

In 1990, due to the change of the economic situation, Dong Ho paintings were difficult to sell and many__________ quit their job.

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

At first, he was reluctant to help US. However, after persuading for a long time, he agreed to play the guitar at our tea-shop.

They (23) __________to defend the city, but they also kept out undesirable people, like those with contagious diseases.

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