1better luck next time
2better off
3better than half
4beyond the reach
5birth certificate
6bit by bit
7bite off more than one can crew
8black and blue
9black and white
10black coffee
11blood test
12boil down to
13book up
1box office
2break down
3break even
4break new ground
5break up
6bright sides
7brighten one's spirits
8bring sb. up to date on sth.
9bring…along