理查德在回答前犹豫了一下。

Richard ___hesitated before answering.

他犹豫了一下，然后说：'我不确定。'

He ___hesitated and then said, "I'm not sure."

不要犹豫购买那张CD；它是一部杰作。

Don't ___hesitate to buy that CD; it's a masterpiece.