Here are the answers based on the pronunciation of the underlined parts in each option:

1. **B: together** - The "th" in "together" is pronounced like /ð/ (as in "this"), while the other options have different sounds.

2. **C: inform** - The "i" in "inform" has a short vowel sound, whereas the "i" in the other options has different pronunciations.

3. **C: counsellors** - The "u" in "counsellors" has a /aʊ/ diphthong sound, while the other options have "s" pronounced similarly.

4. **D: delayed** - The "ed" ending in "delayed" has the /d/ sound, while in "matched," "dripped," and "stressed" it has different pronunciations.

5. **C: listen** - The "t" in "listen" is silent, which differs from the pronunciation of "latest," "hate," and "climate" where the letter is pronounced.

So, the final answers are:
1. B
2. C
3. C
4. D
5. C