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