I . Change these sentences into passive :
They built that house five years ago
.........
She bought a lot of flowers for her mother
.........
The children eat all the vegetables and meat
........
Lien didn ' t finish her homework .
.........
Ba can fix his bike by himself .
.........
He wrote these books for the children .
........
People use this cloth bag again and again .
.......
You don ' t prepare your lesson before you go to school .
.........
Ha Long Bay attracts a lot of tourists
. ........
Thu has seen that movie twice
........