Sure, let's go through each question:

**Question 1:** Choose the word whose underlined part is pronounced differently from that of the rest.
- A. baskets
- B. books
- C. roofs
- D. changes

The underlined parts are:
- A. baskets (/s/)
- B. books (/s/)
- C. roofs (/s/)
- D. changes (/z/)

The answer is **D. changes** because the underlined part is pronounced /z/ while the others are pronounced /s/.

**Question 2:** Choose the word whose underlined part is pronounced differently from that of the rest.
- A. tasty
- B. change
- C. stadium
- D. small

The underlined parts are:
- A. tasty (/eɪ/)
- B. change (/eɪ/)
- C. stadium (/eɪ/)
- D. small (/ɔː/)

The answer is **D. small** because the underlined part is pronounced /ɔː/ while the others are pronounced /eɪ/.

**Question 3:** Choose the word whose underlined part is pronounced differently from that of the rest.
- A. sociable
- B. ocean
- C. receive
- D. special

The underlined parts are:
- A. sociable (/ʃ/)
- B. ocean (/ʃ/)
- C. receive (/s/)
- D. special (/ʃ/)

The answer is **C. receive** because the underlined part is pronounced /s/ while the others are pronounced /ʃ/.

**Question 4:** Choose the word whose stress is placed differently from that of the rest in each of the following questions.
- A. region
- B. event
- C. relax
- D. enroll

The answer is **A. region** because the stress is on the first syllable, while in the other words, the stress is on the second syllable.

**Question 5:** Choose the word whose stress is placed differently from that of the rest in each of the following questions.
- A. behavior
- B. financial
- C. benefit
- D. profession

The answer is **C. benefit** because the stress is on the first syllable, while in the other words, the stress is on the second syllable.