A. problem-solving B. the greenhouse effect C. ring D. cartoon A. anything B. elderly C. educated D. lecture A. rarity B. swallow C. invite D. the Yangtze River A. physician B. call out C. tetrahedron D. boast A. lavishly B. moment C. ethanol D. trick A. fork B. dress up C. utter D. corn A. crime B. cruiser C. dark D. ecosystem A. climb up B. treat C. minority D. clam A. dumplings B. back C. justifiably D. income A. tape B. horror film C. Turkey D. quote