Hello! My name is John. I'm a boy. I'm eleven years old. I have three friends. They are May, Peter and Xiao Mao. May is a girl. She is twelve years old. She is from Canada. Peter is a boy. He is thirteen years old. He is from China. Xiao Mao is a boy. He is two years old, He likes eating meat. Haha, he is a dog!

根据上面短文的意思判断下面的句子是否正确。

James Cameron is one of the most famous____（导演)in the world．

如图，正方体ABCD-A₁B₁C₁D₁的棱长为2，动点E、F在棱A₁B₁上，动点P，Q分别在棱AD，CD上，若EF=1，A₁E=x，DQ=y，DＰ＝ｚ（ｘ，ｙ，ｚ大于零），则四面体PEＦＱ的体积　(   ).