Question

1) The big cake was baked by my mother. 2) My father built this house. 3) The house was built in 1899. 4) Our planet is wrapped in a mass of gases. 5) I gave him a book for his birthday.

Answer 1

1) passive
2) active
3) passive
4)passive
5) active

Answer 2

These sentences are grammatically correct. However, there are a few minor issues that can be improved for clarity and style. Here are the revised versions:

1. My mother baked the big cake.
2. This house was built by my father.
3. The house was built in 1899.
4. A mass of gases wraps our planet.
5. I gave him a book for his birthday.

In the revised versions, the sentences are structured more naturally, and unnecessary words are removed for better readability.