主动：Using that would be the best way (for it)/It is the best by using that---Using that would be better/It is better by using that 至于by省不省略,如果不怎么影响逻辑,不是很正式的地方,可以省略....书面语正规应该it'd better be done，口语上it is better be done是吧？没太深入研究过，习惯了it is 的句型了，哈哈！