Se acepta en este ejercicio el uso de contracciones:
've = have; 's = has; haven't = have not; hasn't = has not

1

He  HAS NOT STOPPED eating since he arrived.

2

I  HAVE SLEPT on every bed in this house and I don't like any
of them. 

3

I  HAVE BEEN WORKING for Mr. Ryan for ten years and
he HAS never SAID "Good morning" to me.

4

He  HAS BEEN TEACHING in this school hundreds of students

but he HAS never MET such a hopeless class as this one.

5

I  HAVE BEEN LOOKING (or HAVE LOOKED) for mushrooms
to prepare my favorite omelette, but I  HAVE NOT FOUND any.

6

A:  Why HAVE you BEEN MAKING such a horrible noise?

B:  I HAVE LOST my key and I HAVE BEEN TRYING to wake

      my wife by throwing stones at her window.

A:  You HAVE BEEN THROWING stones at the wrong window.

      You live next to my house.