Here are the words with their stress patterns indicated:

1. **directory** (di-REC-tor-y) - stress on the second syllable
- **telephone** (TEL-e-phone) - stress on the first syllable
- **invention** (in-VEN-tion) - stress on the second syllable
- **experiment** (ex-PER-i-ment) - stress on the second syllable

**Different pattern**: **B. telephone** (stress on the first syllable)

2. **furniture** (FUR-ni-ture) - stress on the first syllable
- **university** (u-ni-VER-si-ty) - stress on the second syllable
- **humorous** (HUM-or-ous) - stress on the first syllable
- **sociable** (SO-cia-ble) - stress on the first syllable

**Different pattern**: **B. university** (stress on the second syllable)

3. **sociable** (SO-ciable) - stress on the first syllable
- **humorous** (HUM-or-ous) - stress on the first syllable
- **generous** (GEN-er-ous) - stress on the first syllable
- **patient** (PA-tient) - stress on the first syllable

**Different pattern**: **C. patient** (stress on the first syllable but could be considered different because of the syllable count)

4. **delivery** (de-LIV-er-y) - stress on the second syllable
- **equipment** (e-QUIP-ment) - stress on the second syllable
- **electricity** (e-lec-TRIC-i-ty) - stress on the third syllable
- **summer** (SUM-mer) - stress on the first syllable

**Different pattern**: **C. electricity** (stress on the third syllable)

5. **enroll** (en-ROLL) - stress on the second syllable
- **summer** (SUM-mer) - stress on the first syllable
- **hobby** (HOB-by) - stress on the first syllable
- **favor** (FA-vor) - stress on the first syllable

**Different pattern**: **A. enroll** (stress on the second syllable)

In summary, the answers for the different stress patterns are:
1. **B** (telephone)
2. **B** (university)
3. **C** (patient)
4. **C** (electricity)
5. **A** (enroll)