kept himself to的用法和样例：
- He kept himself awake with a drug called modafinil and then put himself to sleep with a hypnotic agent called zopiclone.
- That confident fellow always keeps himself to himself.
- Neither shall the inheritance remove from one tribe to another tribe; but every one of the tribes of the children of Israel shall keep himself to his own inheritance.
- He managed to endear himself to everybody.
- Does he earn enough to keep himself and his family?
- Now he applied himself to the job in earnest.