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根据句意,用括号内所给的适当形式填空。 1. There are four main ______ (role) in Beijing Opera. 2. My mother tells me not to speak to the ______ (strange). 3. I want to live as ______ (happy) as you do. 4. In order to make a hamburger, you need ______ (cut) the bread into halves. 5. The ______ (marry) makes her very happy.