Running is very ____(easy)

Running is very ____(easy) what the running star eats is very healthy(同义句改写)what the running star eats is very healthy.(同义句改写)the running star ____ lots of ____ ____. tom is running very fast 改为感叹句 Tom is running very fast 改为感叹句 Bob is running very fast改为感叹句 Bill is a great running star.He is very well.中,running为什么要用running? She is running ____ a cat. Everyone except them ____ good at ____.A.are running B.is running He is running very fast改复数形式的句子 Hi is running very fast.改复数形式的句子 He is running very fast .﹝改成复数形式﹞ mr lee is running very fast.(改为否定句） He is very t____ after thirty minutes' running. Mike______(is,can)running very fast.填哪个 A woman is running ____ the street.添介词 the girl ____ a red shirt is good at running look out!the car is running ____ you 填什么 ____ the girl is running!这个后面的running是 什么成分啊?