flock|flocked|flocking

成群的鸟儿在空中飞舞。

A ___flock of birds is dancing in the air.

粉丝们蜂拥而至，只为一睹这位明星的风采。

Fans ___flocked to see the celebrity at the event.

粉丝们蜂拥而至，想要一睹这位流行歌星的风采。

Fans were ___flocking to see the pop star.