木头太湿，烧不起来。

The wood was wet and would not ___burn.

壁炉里的火熊熊燃烧。

A fire was ___burning brightly in the fireplace.

过了一会儿，我找到了火柴和木柴，很快壁炉里就燃起了温暖的火。

After a while I found matches and firewood, and soon a nice warm fire was ___burning in the fireplace.