Sure, let's go through each question one by one.

1. Choose the word whose underlined part is pronounced differently from the other three:
- A. stops
- B. climbs
- C. likes
- D. coughs

Explanation: The underlined parts are:
- A. stops /s/
- B. climbs /z/
- C. likes /s/
- D. coughs /s/

The correct answer is B. climbs because the "s" in "climbs" is pronounced as /z/, while in the other words, it is pronounced as /s/.

2. Choose the word whose underlined part is pronounced differently from the other three:
- A. hobby
- B. rubber
- C. thumb
- D. club

Explanation: The underlined parts are:
- A. hobby /hɒb.i/
- B. rubber /ˈrʌb.ər/
- C. thumb /θʌm/
- D. club /klʌb/

The correct answer is C. thumb because the "b" in "thumb" is silent, while in the other words, the "b" is pronounced.

3. Choose the word whose underlined part is pronounced differently from the other three:
- A. prepare
- B. appearance
- C. cupboard
- D. pop

Explanation: The underlined parts are:
- A. prepare /prɪˈpeər/
- B. appearance /əˈpɪə.rəns/
- C. cupboard /ˈkʌb.əd/
- D. pop /pɒp/

The correct answer is C. cupboard because the "p" in "cupboard" is silent, while in the other words, the "p" is pronounced.

4. Choose the word which has a different stress pattern from the other three:
- A. generous
- B. serious
- C. confident
- D. reliable

Explanation: The stress patterns are:
- A. generous (GEN-er-ous)
- B. serious (SER-i-ous)
- C. confident (CON-fi-dent)
- D. reliable (re-LI-a-ble)

The correct answer is D. reliable because it has the stress on the second syllable, while the other words have the stress on the first syllable.

5. Choose the word which has a different stress pattern from the other three:
- A. barbecue
- B. zodiac
- C. museum
- D. character

Explanation: The stress patterns are:
- A. barbecue (BAR-be-cue)
- B. zodiac (ZO-di-ac)
- C. museum (mu-SE-um)
- D. character (CHAR-ac-ter)

The correct answer is C. museum because it has the stress on the second syllable, while the other words have the stress on the first syllable.