The initial idioms of the letter B

Be happy to	be (as) hard as nails
be hard hit (by something)	be hard on
be hard pressed	be hard put
be hard-pressed	be hard up
be head over heels	be hell-bent on
be here to stay	be higher than a kite
be history	be hit for six
be hoist by own petard	be hoist with one's own petard
be home and dry	be home and hosed
be honour-bound	be hot off the press
be hot stuff	be hounded (by someone or something)
be ill at ease	be in
be in a bad way	be in (a bit of) a jam
be in a blue funk	be in a dream world
be in a fix	be in a funk