That is an error on the material. Should be "forgot".

I agree with fdmaxey - to me the sentence makes no sense. Looks like a mistake.

In spoken English, "space out" means to look blankly and not be present; also, it can mean to forget. Literally, "to space" something would mean to physically place objects a certain distance or "space" apart. I do not think he placed objects 1meter apart. I agree with Maxi.

bunked or missed

@fdmaxey Actually, this sentence is from a question of one listening material. You can check this URL (http://www.esl-lab.com/flowershop/flowershoprd1.htm). You can’t miss this sentence, it is question no.4 .