Помогите пожалуйста от этого зависит моя оценка в четверти (3или4)

1. This is my sister. My sister's friend is not here.

2. Mrs Black's parents don't work.

3. The Black's house is very nice.

4. Let's go to the children's room.

5. My sisters are at school. I can play with my sister's toys now.