7、s were in well on(1)There________manytreesthreeyearsago.(2)Theytookaboutfivedaystogetthere________1969.(3)Ilookeditup________theInternet.(4)Mybrother________veryshortbefore,butnoheistall.(5)Icouldn'tridemybike________.18.(3分)选出合适的字母组合补全单词。A. B. C.(