Here are the answers for the exercises provided:

### 1. Choose the odd one out.
1. **A. recycle** (the rest are primarily associated with causing harm or damage)
2. **B. keep** (the rest imply an action of preventing or reducing harm)
3. **B. harm** (the rest imply some form of negative impact)
4. **C. stop** (the others relate to prevention or avoidance)
5. **A. affect** (the rest refer to specific types of negative conditions)
6. **C. health** (the rest refer to forms of negative states or illnesses)
7. **D. dust** (the others relate to negative environmental impacts)
8. **B. poisonous** (the others indicate negative states but not inherently toxic)
9. **A. issue** (the others indicate resolutions or problems)
10. **D. increase** (the others imply a decrease or diminishment)

### 2. Choose the correct word from the given letters.
1. **B. tourism**
2. **D. electricity**
3. **A. environment**
4. **B. land**
5. **D. wildlife**
6. **C. waste**
7. **B. lung**
8. **B. poison**
9. **D. all**

If you have any more questions or need further assistance, feel free to ask!