1. The room ______________ (clean) yesterday. 2. New houses ____________ (build) in our city every year. 3. The book of this writer ______________ (publish) in a month. 4. The trees ____________ (whitewash) by our pupils every spring. 5. Tea _____________ (grow) in Ceylon and India. 6. America _____________ (not/discover) by James Cook. It _____________ (discover) by Christopher Columbus. 7. Pizza ___________ (deliver) in half an hour. 8. Thousands of new cars _______________ (produce) at this plant every year. 9. Ink ___________ (use) for writing many years ago. 10. Some new technologies _____________ (introduce) to the industrial companies at the end of the following month.