根据句意及所给图片，用in，on或under填空

【小题1】The computer is __________ the desk.
【小题2】— Are the books __________ the desk?
— Yes, they are.
【小题3】The pens are __________ the pencil box.
【小题4】— Where is the orange?
— It is __________ the desk.
【小题5】— Is the ball __________ the table?
— Yes, it is.