If you want to find a decent location for your own home, ________ Mr. Smith for advice.
Matter is the name ________ (give) to everything which has weight and occupies space.
将一枚硬币重复掷n 次,以 X 和 Y 分别表示正面向上和反面向上の次数, 则 X 和 Y の相关系数等于（）
关于过渡时期总路线的表述正确的是 ______。
Be careful, _______ you'll fall down.
第二类间断点个数()