What concerns do frodo and gildor have about gandalf?

Frodo and Gildor express concern about Gandalf's absence and the potential dangers he faces. Frodo worries that Gandalf might be caught up in the growing threat of Sauron, given the increasing darkness in Middle-earth. Gildor shares this apprehension, emphasizing the perilous times and the need for Gandalf's wisdom and guidance. Their concerns reflect the uncertainty of their situation and the importance of Gandalf's role in the fight against evil.