句型转换。
1. My parents should allow me to study with friends.(改为同义句)
I should ______ ______ to study with friends.
2. They oft en clean their classroom after school. (改为被动语态)
Their classroom ______ often ______ by them after school.
3. Li Lei gave Tom a new pen last week. (改为被动语态)
A new pen ______ ______ ______Tom last week.
4. It took him ten years to finish writing the book. (改为同义句)
He ______ ten years ______ the book.
5. They will publish these story-books next month. (改为被动语态)
These story-books ______ ______ ______ next month.
