9) 1 book - 2 books 10) 1 dog - 2 dogs 11) 1 cat - 2 cats 12) 1 car - 2 cars 13) 1 house - 2 houses 14) 1 tree - 2 trees 15) 1 chair - 2 chairs
9) 1 book - 2 books
10) 1 dog - 2 dogs
11) 1 cat - 2 cats
12) 1 car - 2 cars
13) 1 house - 2 houses
14) 1 tree - 2 trees
15) 1 chair - 2 chairs