1.The polluted water is harmful to us.(同义改句）

1.The polluted water is harmful to us.(同义改句）
The polluted water _______ _______ to us.
2.The work is failled with mistakes.(同义改句）
The work is ________ ________mistakes.
改错：
1.There are a lot of tourists in many places of interests.
2.The price is too expensive
3.He is unpleased with my answer to the exercise.