15．Mark and his brother Jamie rang their neighbor Mrs．Grady's doorbell．
"Hi，Mrs，Grady，"said Mark when she opened the door．"Would you like us to shovel（铲除）the（56）Bin your yard？"
Shoveling the snow was Jamie's idea，a way to make enough money for a new video game．Mrs．Grady touched her hand to her heart．"That would be wonderful，boys．The work is too much for me．"
"It will （57）C10dollars，"Jamie said．
"Oh dear，"Mrs．Grady was a little disappointed，"I haven't been able to get to the bank．I can （58）Chomemade cookies，but I guess that's not what you had in （59）C．"
Mark was going to say that Mrs．Grady could pay them another time，but Jamie cut him off．
It still snowed （60）B．As they walked （61）Dthe snow out of her yard，Mark suddenly thought up how she helped him las summer．She didn't look like a strong person，but （62）Da 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 （63）Ato hurry it away．
"It was nothing．Good （64）Bwatch out for each other，don't they？"she said when Mark's parents thanked her．
And now Mrs．Grady needed Mark as much as he'd needed her last summer．Mark smiled and began to shovel the snow．
Jamie got surprised and （65）D．"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．"
| 56．A．water | B．snow | C．leaves | D．trash |
| 57．A．take | B．spend | C．cost | D．use |
| 58．A．keep | B．buy | C．offer | D．eat |
| 59．A．heart | B．head | C．mind | D．brain |
| 60．A．easily | B．heavily | C．simply | D．quickly |
| 61．A．across | B．near | C．around | D．through |
| 62．A．if | B．unless | C．althouth | D．When |
| 63．A．shouted | B．spoke | C．talked | D．sang |
| 64．A．families | B．neighbors | C．classmates | D．parents |
| 65．A．patient | B．embarrassed | C．scared | D．angry |
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