音质不是很好，但对于日常使用来说足够了。

The sound quality isn't brilliant but it's ___adequate for everyday use.

委员会为老年人提供的设施几乎不够用。

The council's provision for the elderly is barely ___adequate.

在我看来，动物应该只被关在提供足够生活条件和充足空间的动物园里。

In my opinion, animals should only be kept in a zoo that provides ___adequate living conditions and sufficient room.