Name The Year: Communists take over Czechoslovakia.?

Questions

"----------- is one of the permanent and certain characteristics of a vigorous mind,"- Samuel Johnson - 1751?

"You can never plan the ----------- by the past."- Edmund Burke?

"You can observe a lot by ------------."- Yogi [Lawrence Peter] Berra?

"You can stand tall without -------------- on someone. You can be a victor without having victims."- Harriet Woods?

"You can tell a lot about a fellow's character by his way of eating ------------."- Ronald Reagan?