A. cover B. twenty-eight C. UFO D. heat up A. cosmic B. stairs C. watch out D. star A. proverb B. Jones C. lift up D. justifiably A. Christmas B. cook breakfast C. arcade D. make sure A. challenging B. chug C. calm D. shout A. at the bottom of B. hand in C. prescription D. cycling A. physics B. helpful C. let off D. referee A. shrug B. dim C. imagine D. Olympic Games A. factory B. trouble C. expose to D. extravagant A. baker B. breadfruit C. thinking D. under