11.   He was walking home from school with his friends last October when the shell exploded.

12.   I heard a shell explode, and right after that we began to drop.

13.   On the walls of the buildings were the holes from the molten metal chunks let loose when the shell exploded.

14.   Tank shells exploded on the outskirts of town Saturday.

15.   The injured driver accelerated into a tunnel ahead as eight more shells exploded behind him.

16.   The shell exploded and hot shrapnel set his coat sleeve on fire and mangled his left arm.

17.   The shells exploded every two seconds.

18.   The victims of the accident were milling in and around the mess tent when the shells exploded, sending metal flying.

19.   The third tank shell exploded on a tree over the foxholes.

20.   Two nights later, a single German artillery shell exploded in a ravine where Joe and his comrades huddled.