A. frog B. sit around C. expect D. gray A. impoverish B. electrode C. introduction D. circus A. prefer B. water ski C. deaf D. pipe A. water B. explain C. elderly D. climb A. bullfight B. volunteer C. rattle D. announcer A. operation B. race C. second-hand D. soft drink A. Would you like B. uniquely C. give a helping hand D. at first A. arrive B. event C. give D. quintuplet A. brainstorm B. have class C. upset D. achieve A. file B. die C. prize D. chopstick