2141. The worker used ___ to patch up the hole in the wall.
✅ A. cement
✅ A. cement
✅ A. Mercury
✅ A. Thyroid gland
✅ C. Noun
✅ B. Carbon dioxide
✅ B. Sandfly
✅ C. Chilled water attracts more carbon dioxide
✅ C. down
✅ C. not to neglect his health
✅ B. longest night