气球爆裂，吓到了孩子们。

The balloon ___burst and frightened the children.

突然门猛地打开，持枪警察冲了进来。

Suddenly the door ___burst open and police officers carrying guns rushed in.

如果我再吃蛋糕，我就要撑爆了！

If I eat any more cake I'll ___burst!