1. Building garages and making furniture. Some really keen enthusiasts go so far as to build their own computers.
    有些热衷于自己动手的人甚至自己组装电脑。

2. I look forward to your visit with keen anticipation.
    我殷切期望你的来访。

3. I keen appetite for pleasure even in its simplest and most modest forms.
    我有一种渴望消遣的强烈欲望，哪怕是一种最简单最朴实的方式。