Man's best friend (B)

Dogs and human have had an (a)   for thousands of years.

Dogs have many skills, which they use to help humans in a(n) (a)   of ways.

Dog have very powerful noses and they have a great (a)   for smelling things.

This makes them good at finding lost people and also (a)   item's in people's luggage.

The most important things about dogs is that they are very (a)   ,rarely failing to do as they are told.

How and why humans and dogs begin interacting is still (a)   .

However, we do know that over thousands of years, the wolf has slowly changed into the (a)   dog we have today.

However the relationship began, nowadays, it is clearly (a)   to both humans and dogs