Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
In the later period of the war, enemy planes began to （ ） the city even in the daytime. (bomb)
【正确答案】：BOMB
【题目解析】：
根据上文began to，所以空格处应该动词原形，bomb的动词原形为bomb轰炸；投弹于，且符合句意。句意：在战争的最后阶段，敌军甚至计划在光天化日之下炸毁城市。