Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks.

          Rivers are one of the world's most important natural resources. Many cities are on large rivers, and (23) _______every country has at least one river that plays an important part in the lives of its people.

          Besides transportation, rivers (24) _______ food, water for crops, water to drink, and opportunities for recreation for people who live along their banks. And in order to get water for crops, engineers sometimes build a dam (25) _______a river and let the water become a lake behind the dam. Then people can use their water not only to irrigate fields but also to make electricity for homes and industries.

          However, the water often becomes (26) _______ when cities on river banks grow in size and the number of industries increases. We are learning that it is necessary to keep rivers clean if we want to enjoy the (27) _______of the natural resources.

Mark the letter A, B, C, or D to indicate the word whose underlined part is pronounced differently from that of the rest in each of the following questions.

- “What can I do for you, madam?”

Mark the letter A, B, C, or D to indicate the word whose underlined part is pronounced differently from that of the rest 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.

Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

I only have time to tell you the main idea of it, not the details.

Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.

Nowadays there are more and more places when we cannot use our phone.

Choose the correct sentence A, B, C, or D that is built front the words and phrases given.

We/ought/ submit/assignment/ tomorrow.

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.

- “We appreciate your contribution to the success of our project.”