Fill in the gaps with relative pronouns: who,which,where,whose. Put brackets round

Fill in the gaps with relative pronouns: who,which,where,whose. Put brackets round the relative pronoun if it is not necessary.
I suppose Im not a great art lover. I like posters _____ look good in my bedroom. I usually buy posters ______ I find in big stores. I like buying pictures ____ go well with my mood. Sometimes, I go to art galleries_____I buy copies of famous paintings. I prefer pictures ____ are realistic. Some people _____ I know spend lots of money on paintings _____ are really expensive and _____ look horrible. I have a friend _____ collection of modern art is very valuable. The paintings _____ he buys are perhaps more sophisticated than mine but I'm happy with my collection.