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0. While he was сhoosing a Christmas tree, a flamingo flew near.
1. While he was reading his e-mails, he saw a ghost behind the computer.
2. While he was swimming in the pool, a crocodile caught him.
3. While he was walking across the street, he met a panda.
4. While he was sweeping the floor, Santa came in.
5. While he was watering the flowers, the flower changed its colour.