What is the correct form of the word to fill the blank: I left the house at 8 am and stared at the empty garage in ____________?

The suitable word to complete the sentence is "disbelief." This term conveys a sense of skepticism or inability to accept something as true, which aligns perfectly with the context of staring at an empty garage, likely after expecting to see something. The use of "disbelief" indicates a reaction to a surprising or unexpected situation, suggesting the person was shocked or confused about the absence of something they anticipated.

The other choices do not fit the context as effectively. "Unbelief" generally refers to a lack of belief or faith in a broader sense, which lacks the specific connotation of surprise or incredulity present in "disbelief." "Misbelief" refers to a mistaken belief or misunderstanding, which does not quite capture the emotion of astonishment someone might feel when confronted with an unexpected sight. Finally, "belief" indicates acceptance or conviction in something but does not convey the sense of doubt or shock that is appropriate in this scenario.