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 her last week. 5.He made me do that for him. I ______ ______ ______ that for him. 6.I have given this book to the library. This book ______ ______ ______ to the library. 7.Did he break the window yesterday? ______ the window ______ ______ _____ yesterday?