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Put the verb in brackets in the correct passive form. 1. These trees _____ (plant) last autumn. 2. We _____ (not invite) to a concert last Saturday 3. Mushrooms _____ (gather) in autumn. 4. Many houses _____ (burn) during the Great Fire of London. 5. His new book _____ (to finish) next year. 6. Millions of e-mails _____ (send) every day in the world. 7. The exercise _____ (do) an hour ago. 8. Computers _____ (use) all over the world. 9. The letter _____ (receive) yesterday. 10. Our house _____ (build) in 1990.