Question

drag the missing word into place
well, don’t have a definite volume. they don’t have a
set size or shape either—they can expand within a big container or
squeeze into a tiny one.
gases liquids solids

Explanation:

Gases have no definite volume, size, or shape. They expand or squeeze in containers. Liquids have definite volume but no fixed shape. Solids have definite volume and shape. So the missing word is "gases".

Answer:

gases