A. experiment B. random C. abstract D. bother A. spill B. bring back C. blanket D. pathologist A. asterisk B. lucky C. banish D. earphone A. truly B. stick C. exert D. seem A. either B. now and then C. together D. the Great Wall A. recovery B. subjective C. video D. whistle A. violet B. upward C. poor D. fathom A. go along B. stone C. politely D. biogas A. ring B. task C. precariously D. Benz A. school begins B. style C. cooperate D. advertising