那个江湖郎中声称能治愈癌症，但其实他是个骗子。
That ___quack claimed he could cure cancer, but he was just a fraud.
小鸭子们在水塘边欢快地嘎嘎叫。
The ducklings were ___quacking happily by the pond.
池塘里传来的鸭叫声打破了清晨的宁静。
The ___quacks from the pond broke the morning silence.
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