已知经过点A（1，-3），B（0，4）的圆C与圆x²+y²-2x-4y+4=0相交，它们的公共弦平行于直线2x+y+1=0．

（Ⅰ）求圆C的方程；

（Ⅱ）若动圆M经过一定点P（3，0），且与圆C外切，求动圆圆心M的轨迹方程．

John is the only one of the students in our class that never ______ a mistake even when it is pointed out to him.

A．admit making

B．admits making

C．admit to make

D．admits to make