Moreover,saving energy equals saving our natural resources.两save为什么加ing.

题目

Moreover,saving energy equals saving our natural resources.两save为什么加ing.
还有It seems that everywhere there are classes,conferences,workshops and other opportunities offering a piece of paper upon completion to certify that the paper-holder is qualified to do sth.中offering ,
还有In my opinion,attending such class or preparing for the tests.中attending和preparing为甚用ing.
还有This is（ particularly ture in case of） the current labor shortage in many plants.

答案

saving :都是【动名词】.第一个作主语；第二个作宾语.
attending和preparing也是【动名词短语 】,作主语.
upon：根据,基于.
particularly 【ture打错——true】 in case of 在、、、、、、情况下特别如此/正确.
祝你开心如意!