Definition: doing something fast Level: A1
他思维敏捷，总能迅速理解复杂的概念。
His ___quick mind helps him grasp complex ideas fast.
我们需要快点行动，否则会错过公交车。
We need to make a ___quick move or we'll miss the bus.
他回答得非常快。
He was very ___quick to answer.
