设图 $G=\left\langle V, E>, V=\left\{v_1, v_2, v_3, v_4, v_5\right\}, E=\left\{\left(v_1, v_2\right),\left(v_1, v_3\right),\left(v_1, v_5\right),\left(v_2\right.\right.\right.$, $\left.\left.v_3\right),\left(v_3, v_4\right),\left(v_4, v_5\right)\right\}$, 试
(1) 画出 $G$ 的图形表示;
(2) 写出其邻接矩阵;
(3) 求出每个结点的度数;
(4)画出图 $G$ 的补图的图形.