Optional Relative Pronouns

Look at these sentences, which all use relative pronouns. Which ones can be omitted?

1. That was the place where I'd seen you.
Correct
Not Correct

2. Hannah went to get the book which I'd lent her the day before.
Correct
Not Correct

3. It was raining again. The rain always reminded her of the city where they went for their honeymoon.
Correct
Not Correct

4. Maxine was furious. "Tell that brother of yours, who I never want to see again, that it's over, finished!"
Correct
Not Correct

5. Tell me the song which makes you feel happiest.
Correct
Not Correct

6. The conference will take place in Geneva. Please e-mail a list of all the lectures that you want to attend.
Correct
Not Correct

7. Which is the colour that you would like for the kitchen? Cream?
Correct
Not Correct

8. The man fell over in the street and it was his own sister who found him there.
Correct
Not Correct