2. I had worn blue shoes.
3. The table had been cleaned by Joe.
4. The key had been lost by us.
5. A fight had been started by them.
7. The window had not been closed by me.
8. The paper had not been bought by them.
9. I had not been noticed by her.
10. Had the problem been solved by her?
Do you have any other questions?
The answer is C - It is a waste to use gold for everyday purposes, because it is hard to find.
Answer: B) They enter into the water supply when it rains.
Explanation: The fertilizers pollute the water when it rains.
