like a duckto water —— 如鱼得水
poor as a church mouse —— 一文不名、一贫如洗
at sixes and sevens —— 莫名其妙、不清不楚、昏昏糊糊
spend money like water —— 花钱如流水
as timid as a hare —— 胆小如兔（非常不自信）