useless trivia: What Word Means: A Coffee Cake?

Questions

"------------ make the man. Naked people have little or no influence on society."- Mark Twain (1835 - 1910)?

"Cockroaches and -------------- are the only things that can stay up all night and eat anything."- Herb Caen?

"Work is a necessity for man. Man invented the ---------------."- Pablo Picasso?

"--------- is of two kinds: first, altering the position of matter at or near the earth's surface relative to other matter; second, telling other people to do it."- Bertrand Russell (1872 - 1970)?

"...do your -------------. You can't lead without knowing what you're talking about..."- George Bush (1925 - )?