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1. 科学家们不知道人们能否在其他行星上种植植物。

Scientists don't knowon other planets.

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Serena was the oldest child in the family,and her housework was to mow (割草) their yard. Mrs Martin,their elderly neighbour,was not 1 to take care of her yard,so Serena’s dad promised 2 that Serena would do this job.

“Why didn’t you ask me first?” Serena asked 3.

“Did you ask me first when you got me to be in the school festival last autumn?” asked her father.

“No,I didn’t ask you first,4 you’re always ready to help others. ”

“I try when I can”’ Dad answered. “Serena,we have known Mrs Martin for a very long time. She has always 5 our family. Now we should do something for her in return. What’s more,the 6 you get from helping others makes you wonder who is really helping whom. ”

“I don't know,Dad ,” said Serena. “I only feel 7 after mowing our yard. ”

“I know it’s hard work for you ,” said Dad. “Just wait and see. ”

After 8 at 7:30 a. m.,Serena made her way to Mrs Martin’s yard. She was 9 her job and soon Mrs Martin’s yard looked much tidier. Mrs Martin 10 with a big glass of orange juice and 11 it to her. Serena stopped her work and enjoyed the 12 ,while Mrs Martin was talking to her about all of the flowers in her yard. Seeing the joy (喜悦) in Mrs Martin’s eyes,Serena began to 13 how much the yard meant to Mrs Martin.

After 14 her drink,Serena returned to 15 in the yard,feeling warm in her heart and thinking about what her father said. Her dad was right. It was hard to tell who was helping whom!

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