我尽力帮助她，但她不让我帮。

I ___endeavoured ___to help her, but she wouldn't let me.

我完全同意后者，并且我将尽力从两个角度来看待问题。

I totally agree with the latter and I shall ___endeavour ___to look at both points of view.

科学家们努力寻找这种疾病的治疗方法。

Scientists ___endeavour ___to find a cure for the disease.