3.
1. i think i'll explore the caves
2. he doesn't know. he may take a boat trip around the island
3. Phuong, Tuan and Hoa may build sandcastles on the beach
4. My family and I will swim in the sea
5. they'll be at the seaside on Sunday
6. She'll visit the island on Monday
7. where will you be on Saturday?
8. i think Mai and I will be at school
9. the boys will be in the countryside next month
10. i think i'll visit the mountains tomorrow
11. we will go for a picnic in the countryside
12. they will be at the seaside next week
4.
1. C 2. B 3. A 4. A 5. B 6. A 7. C 8. B 9. A 10. A 11. C 12. A 13. B 14. A 15. A
