Resposta :
1. The teacher always gives "the students" homework
→ The teacher always gives them homework
2. I am reading the book to "my little sister".
→ I am reading the book to her
3. The boys are riding "their bikes".
→ The boys are riding them
4. My father is writing a letter to "John".
→ My father is writing a letter to him
5. I don't know "the answer".
→ I don't know it
6. Sally is going to see "Anne".
→ Sally is going to see her
7. Open "the window", please.
→ Open it, please
8. Can you tell "the people" the way to the airport, please?
→ Can you tell them the way to the airport please?
9. The books are for "Peter".
→ The books are for him
10. Can you help "my sister and me", please?
→ Can you help us, please?