To the men and women who served in World War II and the people they liberated，the G.I. was the common man grown into hero，the poor farm kid torn away from his home，the guy who bore all the burdens of battle，who slept in cold foxholes，who went without the necessities of food and shelter，who stuck it out and drove back the Nazi reign of murder.

1）句中的who served可以改为serving吗？

2） grown可以改为growing吗？