Sure! Here are the correct answers for each blank in the provided text:

16. A. You must stay 60 meters away from this area.
17. **B.** (This would require context from the text that isn't fully visible.)
18. **A.** (Assuming the context is about "today's kids." Again, needs full text for confirmation.)
19. **B. brings** (Father Christmas brings presents.)
20. **C. satisfaction** (Referring to children's feelings about receiving gifts.)

For the reading section:
21. **B. Earth Day** (Topic of the passage.)
22. **C. Lots of people rode their bikes around the town.** (What didn't happen on Earth Day.)
23. **B. The drivers in cars.** (Referring to "them.")

Feel free to ask anything else!