Combine the following sentences, using relative pronouns with prepositions

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2. Combine the following sentences, using relative pronouns with prepositions:
Example: The law was finally abandoned. We had fought against it.
The law against which we had fought was finally abandoned.
1. Here's the address. You should write to this address.
2. He's the man. I sent the money to him.
3. This is the pan. I boiled the eggs in it.
4. Renewable energy sources are difficult topics. I'm not familiar with these topics.
5. This country now has 300 wind turbines. The national network relies on these turbines.