Change to "These" or "Those"

Change from singular to plural
1. That is an elephant >> are elephants
2. This is a book >> are books
3. That is a tiger >> are tigers
4. That is a pencil > are pencils
5. This is a carrot >> are carrots
6. This is a pen >> are pens
7. That is a boy >> are boys
8. This is a box >> are boxes
9. That is a girl >> are girls
10. That is an orange >> are oranges