Change these sentences into passive.
1. That house was built 5 years ago.
2. A lot of flowers for her mother were bought by her.
3. All the vegetables and meat are eaten by the children.
4. Lien's homework wasn't finished by her yesterday.
5. A new bike for Minh will be bought by Mr.Hung
6. These books for the children were written by him.
7. This shopping bag is used again and again.
8. Your lesson for tomorrow is not prepared.
9. Ha Long Bay is going to be discovered.
10. That movie has been seen by Thu several times.