Mark and his brother Jamie rang their neighbour Mrs. gray's doorbell.

"Hi, Mrs. gray,”said Mark when she opened the door. "Would you like us to shovel（铲除）the _____in your yard?”

Shoveling the snow was Jamie's idea, a way to make enough _____ for a new video game. Mrs. gray put her hand on her heart. "That would be wonderful, boys. The work is too much for me."

"It will cost 10 dollars,”Jamie said.

"Oh dear,”Mrs. gray was a little disappointed. "I haven't been able to get to the bank. I can _____ home-made cookies, but I guess that's not what you had in mind. ”

Mark was going to say that Mrs. gray could pay them _____ time, but Jamie cut him off.

It still snowed _____. As they walked_____ the snow out of her yard. Mark suddenly thought of how she helped him last summer. She didn't look like a strong person, but_____ a big black dog had boxed him in a corner, her door flew open. She ran to him and stood between him and the dog. She ______ to hurry it away.

"It was nothing. Good _____ watch out for each other, don't they?”she said when Mark's parents thanked her.

And now Mrs. Gray needed Mark as much as he'd needed her last summer. Mark smiled and began to shovel the snow. Jamie got surprised and______”What are you doing? It will take you all day. No money!"

Mark explained, "Nobody will pay us if we only do things for money."