丙酸钠是一种常用的食品添加剂,其化学式为C3H5OxNa;已知该化合物中碳元素与氧元素的质量比为9:8,请计算:
Beethoven is a very____ (著名的)musician .I'm____ (紧张的)out because I can't find the way home.My mother often____ (担心)about my father's health..She likes to s____ e-mails at school.Lily is very t____ , she'd like to have some water.