Нужен полный вопрос. 1. bob sits at the first desk 2. mary sang to the music 3. you keep books in the bookcase 4. he wants to study maths 5. they study maths at school 6. we left the house at 7 7. the children counted well

Does Bob sit at the first desk?
Did Mary sing to the musik?
Do you keep books in the bookcases?
Does he want to study MATHS?
Do they study MATHS at school?
Did you leave the house at 7?
Did the children count well?