No one is supposed to know our plan. Please keep a lid on it.
Please keep an eye on my children for me. I need to go to the store.
Please keep in down. I'm trying to study.
If you keep your nose to the grindstone, you will do very well.
After work tonight, I'm going to go home and kick back.
Don't take Max seriously. He was just kidding around when he said that you were ugly.
Would you two please knock it off? That really annoys me.