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?
