Sure! Here are the answers based on the exercise you've shared:

### PRONUNCIATION
1. **B chef** (the 'ch' sound is different)
2. **A such** (the 'u' sound is different)
3. **D machine** (the 'ch' sound is different)
4. **C champagne** (the 'ch' sound is different)
5. **B orchestra** (the 'or' sound is different)

### VOCABULARY
a. Circle the odd one out:
1. **B room** (the others are bodies of water)
2. **D nature** (the others are types of institutions)
3. **A dirty** (the others are clean states)
4. **B facilities** (the others are types of vehicles)
5. **C noise** (the others are forms of artistic media)

b. Complete the sentences:
6. There isn't much **fresh** air in busy cities.
7. Traffic **noise** is a serious problem in big cities.
8. My mother quite likes to walk in the park for some **peace**.
9. There are lots of **vehicles** in big cities, and they can cause traffic jams.
10. There isn't much **entertainment** in my village - just a cinema and a sports center.

### GRAMMAR
a. Circle ONE mistake in each sentence:
1. **There is many** fresh air in the city. (should be "There is much")
2. **There isn't too many** entertainment in my hometown. (should be "too much")
3. **We do not have much** necessary facilities in town. (should be "many")
4. **There are a lots** of fresh fruit and vegetables on my father's farm. (should be "a lot")
5. **there aren't too much** vehicles. (should be "too many")

Feel free to ask if you have any more questions!