1‘the forecast investment boom did not materialize’
happen, occur, come about, take place, come into being, transpire, arise, be realized, take shape
informal come off, shape up
archaic come to pass
2‘Harry suddenly materialized at the kitchen door’
appear, turn up, arrive, make in an appearance, put in an appearance, present itself, present oneself, come into sight, come into view, emerge, surface, loom, become visible, show itself, show oneself, reveal itself, reveal oneself, show one's face, come to light, pop up
informal show up, fetch up, pitch up, blow in
We take a look at several popular, though confusing, punctuation marks.