fall apart|falling apart

它看起来随时都会散架。

It looks like it's going to ___fall ___apart any day.

当我触碰时，那本旧书开始散页。

The old book started to ___fall ___apart when I touched it.

我那双可怜的旧靴子快要散架了。

My poor old boots are ___falling ___apart.