Mary spends two hours her homework every day.
A：doing
B：to do
C：does
D：did
— ____ , Jack!
小敏、小刚、小明是同班同学。小敏喜欢通过阅读来学习，小刚觉得听别人讲更容易学到知识，而小明觉得自己动手的事情更容易记住。这说明（ ）
I can____(run, running) very fast.
