１ The third time lucky.
２ Every man has his humor.
３ Even a chance acquaintance is decreed by destiny.
４ Don't teach fish to swim.
５ The person who touches pitch shall be defiled
６ Too many cooks spoil the broth.
７ Necessity knows no law.
８ When one door shuts, another opens.

問題文訂正も兼ねて整理です。
まだヒント＆再回答は解禁しなくていいかな？