With the boy __________ the way, we had no difficulty in finding his house.
If the dog hadn’t woken us, we wouldn’t have noticed the fire and it _______ to the house next door.
When the man came in, gun in hand, we all stood there, ________.
If nature does not provide man with the necessary material, it is the laboratory ____ he will turn to for it.
By the time you have completed the essential training, you _____ exposed to virtually every new feature of the course.
_______ more to be pitied than blamed.