如图，在平面直角坐标系中，正比例函数y=kx（k＞0）与反比例函数y= $\frac{3}{x}$ 的图象分别交于A、C两点，已知点B与点D关于坐标原点O成中心对称，且点B的坐标为（m，0）．其中m＞0．

下列计算或化简正确的是（　　） 

下列命题错误的是（　　）

用括号中所给单词的适当形式完成下列句子
____ The students took the PISA test in _________ subjects - reading, maths and science. (third)
____ Board games are more and more popular among          . (teenager)
____ I liked to walk in fields on         days and to see my footprints left behind. (snow)
____people often begin their conversations by talking about the weather. (Britain)
____ The news about education has attracted the public attention        (recent)
____ The World Chocolate Park showed a         of many kinds of chocolates. (collect)
____ To improve your writing skills, you'd better         a habit of reading. (development)
____ Don't tell lies. Nobody likes those         people. (honest)