this is a ................ this is an ...............

1. this is an book
2. this is an umbrella
3.this is a table
4.this is a apple
5. this is an house
6. this is an student
7. this is an piece of chalk
8.this is an honest man
9. this is an uniform
10.this is an notebook
11.this is an elephant
12.this is an man
13.this is an woman
14.this is an chair
15. this is an orange
16.this is an desk
17.this is an university
18.this is an teacher
19.this is an box
20.this is a house
21.this is an insect
22. this is an pencil
23.this is a hour
24. this is a blackboard