题目

Aurora(极光):wonders or disturbancesCanada，February 2017:I stood in the snow on a frozen lake, watching as the sky twisted in front of me. Green bands of light 【1】 out in the darkness. Slowly the colours twisted and broke and reappeared elsewhere until, suddenly, a whole band flowed and pulsed across the sky, 【2】 with delicate yellow. pinks and purples. It was as dramatic as thunderstorm, yet calm.Gentle,yet【3】,Most of all, it was a gift.This was my fifth aurora trip and the first time I had seen fast movements and bright colours.The calm green auroral displays that many people 填介词： Bus _________ bus went by and none stopped.