A:直角坐标系中横、纵坐标相等的点能够组成一个集合
B:π∈{x|x<3,x∈R}
C:∅={0}
D:{(1,2)}⊆{1,2,3}
— I'm going to ____ ____ ____ with my family.
I didn't do very well in this exam. Unluckily, he did it .