Here are the correct answers for the blanks in the passage along with explanations:

### Passage: Life in the Countryside

1. **(1)** A. **busy**
- People in the countryside often lead busy lives, working outside and tending to crops and animals.

2. **(2)** C. **harvest**
- Farming is key to their activity, which includes growing and harvesting crops.

3. **(3)** A. **spend**
- They spend more time outdoors as opposed to being indoors.

4. **(4)** B. **more**
- People enjoy more relaxation and increases their interaction with nature.

5. **(5)** D. **different**
- The lifestyle of rural people is different from that of urban dwellers.

6. **(6)** B. **good**
- This environment usually is good for young people’s development and mental health.

7. **(7)** D. **health**
- Living in the countryside often leads to healthier lifestyles.

8. **(8)** C. **improve**
- Engagement in physical activities helps improve their physical health.

9. **(9)** C. **find**
- People move to find a peaceful way in their lives.

10. **(10)** B. **different**
- They seek different ways as they find themselves in a changing environment.

### Passage: Teenagers' Lives Today

1. **(1)** A. **different**
- Teenagers today are different from those in previous generations due to advances in technology.

2. **(2)** B. **knowledge**
- They have access to information and social media that help expand their knowledge.

3. **(3)** D. **time**
- The internet can be a distraction that takes away their time from studying.

4. **(4)** A. **quality**
- Quality time is important for social interactions and maintaining relationships.

5. **(5)** B. **important**
- It's important for them to understand the balance between online and offline life.

6. **(6)** C. **balance**
- A balance could help them maintain a healthy social life.

7. **(7)** B. **dealing**
- This helps them deal with problems they may face, like sleep issues or lack of exercise.

8. **(8)** D. **enjoying**
- Physical activity can be enjoyable, which makes them feel good.

9. **(9)** A. **gain**
- Gaining insight into effective time management is crucial.

10. **(10)** C. **navigate**
- They need guidance to navigate these important years.

Following these selections will complete the passages correctly and meaningfully. If you need further help or clarification, feel free to ask!