I have a friend. His name is Jack. ③He is healthy because(因为) he plays sports. He runs every day. He runs to his ___①____ in the morning and he runs ____②____ after school in the afternoon. He can run fast. He likes playing soccer, volleyball, tennis, basketball , ping-pong and more. He has three soccer balls, two volleyballs, six tennis rackets, four basketballs and many ping-pong balls. They are in his room. He plays sports with his friends every day. He likes many sports stars and he often watches them on TV. All my classmates say Jack is sporty (爱好体育)。

已知$\alpha$为第二象限角，则$\frac{2\sin \alpha }{\sqrt{1-{\cos }^2\alpha }}+\frac{\sqrt{1-{\sin }^2\alpha }}{\cos \alpha }$的值是（  ）