1. Legend has it that,during the Chinese Tang dynasty, a poor public was so honest that he refused to takebribes.

이 문장에서 맨 앞에 있는 Legend has it that의 that은 앞에 있는 it의 동격을 뜻하는 that인가요? 특별히 도치가 된건 아닌지.. it has legend that인데 뭐 legend를 강조하려고 앞으로 보내준건지~

2. their venom is about as poisonous as diamondback rattlesnake vecom.

이문장에서 about은 왜 들어간걸까요?

3. The first workman would receive the most important parts, and would put these together and pass them on to the next who would do the same, and so on until the complete revolver is put together.

이 문장에서 and so on은 특별한 의미가 있는건 아닌가요~?

셋 중 하나라도 좋으니 분석 부탁드립니다^^