kept on top of的用法和样例：
- The Prime Minister kept on top of the Opposition more by their ineptitude than by his own skill.
- We like to keep on top of things.
- Studying isn't hard if you keep on top of it.
- I kept on top of things of my friends by teleponing every day.
- He tried to keep on top of developments in his field.
- I go to the bank twice a month to keep on top of my finances.