crumple|crumpled|crumples|crumpling

一张纸被揉成一团。

A piece of paper is ___crumpled.

他揉成一团纸。

He ___crumples a piece of paper.

这张纸揉成一团后变得皱巴巴的。

The paper is ___crumpling after being squeezed into a ball.