A：big
B：good
C：new
He needs more paper _________.
Tom rode his motorbike to work yesterday and had a crash with a car. His motorbike was ________ and he was seriously ________.
火柴在空气中燃烧，长期露置在空气中的石灰水表面会出现一层白色固体物质，天空中有时会出现下雨下雪现象，这些现象分别是因为空气中含有____，____，____造成的。
