Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
空っぽ からっぽ prázdnýleda1
手がかり てがかり (1)clue, key, trail, scent, track, contact, (2)handhold, on hand mix
空く あく to become vacantgodan, jlpt3, jlpt5, leda1, verb, vintrans
そら skyjlpt5, leda1, shizen
空ける あける vyprázdnit (láhev)ichidan, jlpt3, leda1, verb, vtrans