The doctors did what they could_______ those w-ho were injured in the terrible accident.

I was not good at math, so my friend helped me _____ it last night. [ ]

Have you ________ been to New York?– No, ________.

Peter and I ________ in the same class. ________ are good friends.

Hi, Amy. Why are you so sad?—Well, I found the computer I had had _________ went wrong again.