Home / HSK Vocabulary / HSK 4 / 空 空 kōng HSK 4 · B2 Meanings empty air sky in vain Quick facts Strokes8 HSK LevelHSK 4 CEFRB2 ← Back to HSK 4 word list Practice 空 with flashcards MandoBridge uses spaced repetition to help you remember HSK 4 vocabulary — free on iOS and Android.