4.I left a book at your place yesterday.(改为否定句) I---- ---- a book at your place yesterday.

4.I left a book at your place yesterday.(改为否定句) I---- ---- a book at your place yesterday.
5.Do you know?Where is it?(合并成一句 )
Do you know ------ ------ ------
6.He’s too young to go to school.(改为同义句)
He isn’t ---- ------ ------ go to school.
7.UNICEF raises money (by selling Christmas cards).(就划线部分提问)
------ ------ UNICEF --------money?
8.The water was so dirty that we couldn’t drink it.(改为同义句)
The water was ------- dirty ----- ----- ------ drink
9.She went to school though she was ill.She didn't stay at home.(合并成一句)
Though she was ill,she went to school ----- ----- ----at home.