信号弹在夜空中突然亮起，照亮了整个区域。

The signal ___flare suddenly brightened in the night sky, lighting up the whole area.

当他听到这个消息时，突然怒气冲冲。

He suddenly ___flared up when he heard the news.

登山者在迷路时点燃了信号弹寻求帮助。

The hiker lit a ___flare when he got lost to call for help.

这条牛仔裤在裤脚处略微向外展开。

These jeans slightly ___flare at the ankles.