Here are the suggested answers for the questions based on the provided text:

### I. Choose the correct answer A, B, C, or D
1. A. linked
2. A. bones
3. A. solar
4. D. myth

### II. Choose the correct answer A, B, C, or D to complete the sentence
5. A. an
6. B. on
7. A. length
8. C. boredom
9. B. cultural
10. D. must
11. D. Despite
12. A. too
13. A. used
14. B. carry on

### III. Choose the best option for the sign
15. D. Take nothing but pictures, leave nothing but footprints.
16. A. Children must be accompanied by adults.

### IV. Complete the sentence
17. Families **spend** more time together compared to today.
18. We **do not realize** how different life would become in the future.
19. Farmers had to wake up early **to take** care of their crops and animals.

Feel free to ask if you have any other questions!