New words：

challenge [ˈtʃæləndʒ]
n.挑战；质疑
v.向(某人)挑战；考查；盘问；对…怀疑（或质疑）

Sample Sentences：

He raised a challenge to the decision.
This math problem is a ​​challenge​​ for most students.
The teacher gave us a ​​challenge​​ to read 10 books this month.

Tom ​​challenged​​ me to a race after school.
The police ​​challenged​​ his ID at the airport.
Their school challenged ours to a football match.
I don't have the courage to challenge my boss's decision

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