Her story shows how gentle （） and an indifference to honors and fame can lead to great achievements.

单项选择题More thunderstorms （） in summer than any other time of the year.

A．happened
B．have happened
C．happen
D．will happen

单项选择题The （） he said it he knew what a mistake he had made.

A．moment
B．time
C．occasion
D．hour