1.run over

　　I ran over my paper before giving it.

　　The class ran over by 10 minutes.

　　2.hand (sth.) over

　　It's mine. Hand it over!

　　3.look (sb./sth.) over

　　I think you'd better have the doctor look you over.

　　4.over one's head

　　Your explanation is totally over my head.