Let's analyze each option:

1. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. t**a**ble (pronounced /eɪ/)
- b. eraser (pronounced /ɛ/)
- c. lamp (pronounced /æ/)
- d. bookcase (pronounced /eɪ/)
- **Correct Answer:** **b. eraser** (The 'a' in eraser is pronounced like /ɪ/)

2. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. hundr**e**d (pronounced /ɛ/)
- b. get (pronounced /ɛ/)
- c. every (pronounced /ɛ/)
- d. desk (pronounced /ɛ/)
- **Correct Answer:** None of these have a different pronunciation, as they are all pronounced /ɛ/.

3. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. f**a**ce (pronounced /eɪ/)
- b. small (pronounced /ɔ/)
- c. grade (pronounced /eɪ/)
- d. late (pronounced /eɪ/)
- **Correct Answer:** **b. small** (The 'a' in small is pronounced /ɔ/)

4. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. b**en**ch (pronounced /ɛ/)
- b. school (pronounced /uː/)
- c. children (pronounced /ɪ/)
- d. chair (pronounced /ɛ/)
- **Correct Answer:** **b. school** (The 'ch' in school is pronounced /uː/, while the others are /ɛ/ or /ɪ/)

5. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. st**oo**l (pronounced /uː/)
- b. room (pronounced /uː/)
- c. afternoon (pronounced /uː/)
- d. door (pronounced /ɔ/)
- **Correct Answer:** **d. door** (The 'oo' in door is pronounced /ɔ/)

6. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. sm**a**ll (pronounced /ɔ/)
- b. face (pronounced /eɪ/)
- c. grade (pronounced /eɪ/)
- d. late (pronounced /eɪ/)
- **Correct Answer:** **a. small** (The 'a' in small is pronounced /ɔ/)

7. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. br**ea**kfast (pronounced /ɛ/)
- b. teacher (pronounced /iː/)
- c. ready (pronounced /ɛ/)
- d. heavy (pronounced /ɛ/)
- **Correct Answer:** **b. teacher** (The 'ea' in teacher is pronounced /iː/)

8. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. t**i**me (pronounced /aɪ/)
- b. fine (pronounced /aɪ/)
- c. five (pronounced /aɪ/)
- d. city (pronounced /ɪ/)
- **Correct Answer:** **d. city** (The 'i' in city is pronounced /ɪ/)

9. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. engin**ee**r (pronounced /ɪː/)
- b. greeting (pronounced /iː/)
- c. teeth (pronounced /iː/)
- d. street (pronounced /iː/)
- **Correct Answer:** None of these have a different pronunciation, as they are all pronounced /iː/.

10. **Choose the word whose underlined part is pronounced differently from the other three:**
- a. ch**ai**r (pronounced /ɛ/)
- b. school (pronounced /uː/)
- c. couch (pronounced /aʊ/)
- d. children (pronounced /ɪ/)
- **Correct Answer:** **b. school** (The 'ch' in school is pronounced /uː/)

Here are the final answers:
1. b. eraser
2. All are /ɛ/
3. b. small
4. b. school
5. d. door
6. a. small
7. b. teacher
8. d. city
9. All are /iː/
10. b. school