1.the significance of… cannot be overvalued. it will…; it will… ……
的意义再怎样评价也不过火，它会……，还会……

2. what will happen to…? nobody really knows. but one thing is certain, … ……
会发生

啥作业?没人切当晓得。但有一件事可以断定：……

3. following these suggestions may not guarantee the success, but the payoff might be worth the effort. it will not only benefit.., but also benefit…?
或许这些办法并不能保证获得成功，可是值得一试。它不但会谋福……，而 且……也会获益。?