A. boarding B. mistake for C. sediment D. upside A. milkman B. limit C. play jokes on D. in ruins A. at a time B. dioxide C. UFO D. spread A. overrun B. fortunately C. senior D. up to standard A. itself B. interstellar C. humanity D. cart A. agreeable B. family name C. fibre D. eyesight A. beef B. warmth C. super D. entitle A. thinking B. pair C. underground D. upstairs A. archway B. secrecy C. phone call D. educator A. conclusion B. teaspoonful C. puncture D. certificate