5. this is the house which/where i grew up in.
6. some environmental problems that/what occurred were predictable.
7. they'll protect all the endangered species of animals that/what
they think have their habitats there.
8. no one was expecting that/what came next.
9. it's that/what i had read about before.
10. it's just that/what i'd like to know about.
)
ответ:5)which 6)what 7)that 8)what 9)that 10)what
Объяснение: