what are you doing?

Are ____________________ walking up a hill ? Yes , ____________________ .
Is ____________________ swimming in the lake ? ____________________ , she isn't .
Is he riding a bike on the road ? Yes , ____________________ ____________________ .
Are you jumping ____________________ ____________________ leaves ? ____________________ , I'm not .
Is he running down a hill ? No , ____________________ ____________________ .
Is ____________________ walking across the bridge ? ____________________ , she is .
Are you riding a ____________________ across the sand ? Yes , ____________________ .