Exercise 1. 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.

1. A. culture                B. public                C. sustain                D. butterfly

2. A. pollution                B. coral                C. problem                D. ecology

3. A. discount                B. observe                C. safari                D. scuba-diving

4. A. relax                B. departure                C. benefit                D. interest

5. A. nature                B. manage                C. balance                D. campfire

Unit 10 - (HS)