cinder|cinders

他从篝火中挑出一块还在发红的煤渣。

He picked out a glowing ___cinder from the campfire.

大火过后，只剩下几堆灰烬和烧焦的木头。

After the fire, only a few ___cinders and charred wood remained.

火山喷发后，地上散落着许多多孔的火山渣。

After the eruption, the ground was covered with porous ___cinders.