Here are the answers to the questions in the document:

**I. PRONUNCIATION:**
1. **A** - rural (pronounced differently)
2. **C** - application (stress difference)
3. **B** - ensure (stress difference)
4. **C** - apply (stress difference)
5. **C** - announcement (stress difference)
6. **A** - practical (stress difference)

**II. Give the correct forms (Past Simple or Past Continuous):**
1. Susan (studied) in her room when she heard the noise.
2. What (met) you at eleven PM last night? It was so noisy.
3. After going to the library, I (went) to meet Jack for some coffee.
4. I was six years old when my elder sister (taught) me how to ride a bike.
5. John (did) not know anything about the plane crash in my neighborhood because I (was working) inside at the time.

**III. Choose the best answer:**
1. A - effective
2. B - useful
3. A - benefit
4. C - excited
5. D - solution
6. C - reduce
7. B - disadvantaged
8. A - cleaned
9. B - did arrived
10. D - balanced
11. D - applied

Feel free to ask if you need further clarification or more help!