He taught in this school last year.(把last year改为 since last year)
He _________ _________ in this school _________ last year.
They didn’t clean the classroom yesterday.(改为被动语态)
The classroom _________ _________ yesterday.
We have already returned the books.(改为否定句)
We _________ __________ the books ___________.
Rice is grown in China.(划线部分提问)
_________ is rice ___________?