阅读短文，从各题所给的选项中选择最佳选项。
It was Friday night and Marty was relaxing in a chair. His mom was washing the dishesin the kitchen. But before she could finish, 1 didn't feel well and had to stop. She said she would do it after a 2 .
"Are you OK, mom?" asked Marty.
His mom said, "Yes, I'm fine. But I need to rest." Then she went to 3 .
Marty felt a little 4 . He knew he should help his mom more. 5 when his mother rested, he 6 all the dishes and cleaned the kitchen. The kitchen was very clean and Marty felt much better.
When Marty's mom woke up, she thought she had 7 to do. She had to clean the kitchen and wash all the dishes. But when she went to the kitchen, she could not believe her 8 . The kitchen was so clean. She 9 Marty for all his work. She told him he was a really nice boy.
On that day, Marty learned that 10 others makes everyone happy. It makes others feel happy, and it makes you happy, too.
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（一氯环己烷） 
B 
