他很安静。

He is ___quiet.

森林里很安静，只有树叶沙沙作响。

The forest is ___quiet, only the leaves rustling.

图书馆里需要保持安静。

You need to be ___quiet in the library.

图书馆里很安静，适合学习。

The library is very ___quiet, perfect for studying.