Here are the words with the underlined parts, identified with different pronunciations:

I. Choose the word whose underlined part is pronounced differently from the others:
1. **pottery** (a) - /ˈpɒt.ə.ri/
- product (b) - /ˈprɒd.ʌkt/
- workshop (c) - /ˈwɜːk.ʃɒp/
- **conical** (d) - /ˈkɒn.ɪ.kəl/ (correct answer)

2. **surface** (a) - /ˈsɜː.fɪs/
- layer (b) - /ˈleɪ.ər/
- workshop (c) - /ˈwɜːk.ʃɒp/
- **frame** (d) - /freɪm/ (correct answer)

3. **weather** (a) - /ˈwɛð.ər/
- **thread** (b) - /θrɛd/ (correct answer)
- together (c) - /təˈɡɛð.ər/
- rather (d) - /ˈrɑː.ðər/

4. **historical** (a) - /hɪˈstɔːr.ɪ.kəl/
- **system** (b) - /ˈsɪs.təm/ (correct answer)
- landscape (c) - /ˈlænd.skeɪp/
- business (d) - /ˈbɪz.nɪs/

5. **carved** (a) - /kɑːrvd/
- impressed (b) - /ɪmˈprɛst/
- **embroidered** (c) - /ɪmˈbrɔɪ.dərd/ (correct answer)
- woven (d) - /ˈwoʊ.vən/

Thus, the answers are:
1. d (conical)
2. d (frame)
3. b (thread)
4. b (system)
5. c (embroidered)