What is any nation proud of? - Any nation is proud of its culture.
What were the students tired of? - The students were tired of boring excursions.
What was the museim full of? - The museum was full of tourists.
What is any capital city rich in? - Any capital city is rich in monuments.
What are Oxford and Cambridge famous for? - Oxford and Cambridge are famous for their Universities.
What was she proud of? - She was proud of her unusual pictures.