将下列各句改为被动句。 1. We can finish the work in two days. The work _____ in two days. 2. The children will sing an English song. An English song _____ by the children. 3. You needn't do it now. It _____ by you now. 4. Lucy sent me a New Year card last week. A New Year card _____ me by Lucy last week. 5. He made me do that for him. I _____do that for him. 6. I have given this book to the library. This book_____to the library by me. 7. Did he break the window yesterday? _____ the window _____ yesterday?