A.
腊月二十三灶王爷上天。 On the twenty-third of the twelfth lunar month, the Kitchen God went up to heaven.
B.
三个臭皮匠, 合成一个。 Three cobblers with their wits combined equal Zhuge Liang, the master mind.
C.
要标本兼治, 不能头疼医头,脚痛医脚。We should address both the symptoms and the root cause of the problem.