用括号中所给的正确形式填空。 1) This sort of work ________ great patience. (demand) 2) His collection of paintings is most __________. (impress) 3) I play the piano for _________. (relax) 4) Her ideas met with a _________ response. (favor) 5) We have received a number of _________ about your conduct. (complain) 6) This year’s sales figures are very __________. (encourage) 7) Rapid breathing is a danger ______ and you should call your doctor. (signal) 8) Did I really hear someone come in, or was it only a_____? (fancy)