1 stands for a persistent idiom or four-word idiom, the last word rhymes with O. Idioms include: hard work, endless writing, silence, good deeds, and a promise of 1000 yuan.
2. The last idiom with a U rhyme is: mainstay, dwarfed by others, finding both ends meet, smelling chickens and dancing, singing and dancing, hungry for food, implicating nine famous families, famous families and everything in the world, full of wisdom and tricks.
3. The last idiom with E rhyme is: careless, careless, dissatisfied, sincere, unexpected, proud and dissatisfied.