1 Carlos / study / history at university. 2 This week he / learn / about ancient history. 3 At the moment he / read / a book about ancient Rome. 4 He / not enjoy / the book because he / think / it not be / very interesting. 5 Today his grandparents / visit / him at university. 6 His grandmother / know / he be / always hungry.

Sure, here are the sentences filled in with the correct verb tenses:

1. Carlos studies history at university.
2. This week he is learning about ancient history.
3. At the moment he is reading a book about ancient Rome.
4. He does not enjoy the book because he thinks it is not very interesting.
5. Today his grandparents are visiting him at university.
6. His grandmother knows he is always hungry.