Задание №82385 ЕГЭ Английскому языку

 Образуйте от слова THOROUGH однокоренное слово так, чтобы оно грамматически и лексически соответствовало содержанию текста.

Birds may have to travel long distances to find water in the desert. But this is impossible for little chicks. To solve this problem the male sandgrouse has special feathers on his tummy which act like sponges to hold water. He flies off to find and ____________ soaks its feathers.