3.

a) nothing

b) the smell

c) a bad cold

d) a den

e) dirty

4.

a) clean

b) dirty

c) nothing

d) animal

e) flower

5.

a) I don't have a bad cold

b) The den isn't very dirty

c) He doesn't kill the Bear

d) He doesn't ask the Rabbit

e)The smell isn't so bad

f) I don't want to speak to you