What's this? It's a paper clip. / This is a paper clip.
What's this? It's a door. / This is a door.
What's that? It's a calendar. / That's a calendar.
What's this? It's a pencil sharpener. / This is a pencil sharpener.
What's that? It's a workbook. / That's a workbook.
What's this? It's a picture. / This is a door.
What's that? It's a clock. / That's a clock.
What's that? It's a window. / That's a window.