(1)keep sb+adj.(正确）(接形容词复合宾语：即宾语+宾补结构）

Excitement kept him awake.他兴奋得不能入睡。

Try your best to keep the children quiet.你要尽量使孩子们保持安静。

The experiment kept us busy for three months.这项试验使我们忙了三个月。

(2)keep +adj.(正确）（系动词+表语结构）

I was so sleepy that I could hardly keep awake .我太困了,简直要睡着了。

My mother still keeps young.我母亲还不见老。

Why do you keep silent?你怎么不说话?

(3)keep doing sth(正确）（接动名词作宾语结构）

The baby kept crying.婴儿一直哭。

She kept studying.她一直在学习。

Please keep sitting where you are.请继续坐在原处。

(3)keep one's health(错误）