大雨过后，可以看到许多蚯蚓爬到地面上来，这是由于[ ]

A．蚯蚓喜欢水多的环境

B．雨后地面上食物较多

C．土壤中缺少空气

D．洞穴内太干燥

They _____ on the little professor, but it led to his fierce criticism on us.   [ ]

A. played a joke    

B. made fun

C. had fun  

D. performed a joke