The answer is "an infinitive verb".
Acabar de + infinitive is used to express an action that has ended prior the enunciation of the sentence.
it would be estamos
nosotros estamos en la casa
i believe thats the answer
A wedge is a simple machine that consists of two inclined planes, giving it a thin end and thick end. ... A wedge makes work easier by increasing the force applied to the object, although it applies the force over a shorter distance. This gives the wedge a mechanical advantage greater than 1.
