Complete the ghost hunter's spooky field notes.

_____ the strange noises in the attic are just mice, but I am bringing my ghost-catching vacuum just in case!

The correct answer is Maybe.

"Maybe" (one word) is an adverb that means "perhaps" or "possibly," and it often goes at the beginning of a sentence. "May be" (two words) is a verb phrase that comes after a subject (for example, "It may be a ghost").