Answer:
1. He said that it's hot.
2. He said that Mariah Carey is a good singer.
3. Carla says/said that she's on vacation.
4. Tom said that rock salt is good for health.
5. He said he always drink water.
6. He mentioned that the sun always rises in the east.
7.He added that Sue arrived on Sunday.
8. He answered that she composes songs.
9. He adds/added that Dina works for her father.
10. He advised that foods must be carefully picked.
11. She urged that we need to take care of our pets.
12. She said that ants are smart.
13. He said that Rose wants to play basketball.
14. He mentions/mentioned that students need to learn the important skills.
15. She said that she lives in Makati City.