选词填空,完成短文。(只填序号) A. stream B. Drop C. rain D. cloud E. sun F. vapour Hi, I am a little Water 1__________. You can call me Mr Drop. I am in the 2__________. The 3__________ comes out. I am very hot. I am now 4__________. I see many friends. I am now in a 5__________. It's cloudy now. I am heavy. I fall. I am now 6__________.