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Упражнение 3. Вставьте am, is are.
A) I'm in the park. I can see some children. They ____ playing volleyball. There's my friend Greg! He ____ reading a book. The girl ____ eating a sandwich. The boy and the dog ____ playing with a ball. They can't see me because I ____ sitting in a tree. What ___ you doing? ____ you listening to me?