The initial idioms of the letter B

be another matter	be another of life's great mysteries
be another thing	be anybody's guess
be armed to the teeth	be around
be as [crazy etc.] as they come	be as [fast etc.] as all get out
be as American as apple pie	be as (something) as they come
be as bald as a coot	be as black as are is painted
be as blind as a bat	be as bright as a button
be as clean as a whistle	be as cold as ice
be as cute as a button	be as daft as a brush
be as dead as a dodo	be as dead as a doornail
be as deaf as a post	be chalk and cheese
be as dry as a bone	be as dull as dishwater
be as easy as abc	be as easy as pie
be as easy as falling off a log	be like taking candy from a baby
be as fit as a fiddle	be as flat as a pancake