If I were in his situation, I would (not) ...

                                                  cut my arm
                                                  break the boulder
                                                  move the boulder
                                                  push the rock with my foot
                                                  commit suicide
                                                  be courageous and strong
                                                  abandon / give up
                                                  want to die
                                                  drink my pee
                                                  wait

If Aaron didn't move the rock, he wouldn't... survive.
If he moved the boulder, he would... be free.
I he screamed, he would ... lose energy and he would die faster.