题目内容
Sharing things has gradually become a common _____.
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His success has been a source of _____of many young people, encouraging them to work harder and try something new.
It can be difficult to _______ the effectiveness of different treatments.
He finally _______ his ambition to save enough money to buy a big house before retirement.
He felt a strong sense of ________ when he thought about how he had treated his friends.
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