before ----> earlier than
　　before law and order were established // cheating and robbing each other ----> lawless
　　before long // right away // by and by // on short notice ---- > immediately // quickly // shortly // soon
　　before we start our first lab ---- > at the beginning of the semester
　　begin one's study ---- > an introductory class
　　believe ...? ---- > surprise
　　best ---- > delicious // most appropriate
　　be up to sb. // count on sb. ---- > sb. can decide // sb. may make the decisions
　　be useful ---- > help
　　be/feel under the weather ---- > be/feel (a little) ill/sick
　　be/get used to (doing) sth. ---- > be/get accustomed to sth.
　　be/run low on sth. ---- > buy sth.
　　be/stay up (doing) ---- > make a night of it
　　beach ---- > seashore
　　better ---- > improvement // so good // happy
　　better off ---- > well off
　　blow above the shore line hills ---- > come from over the hills
　　boil down to ---- > wind up
　　boring // have an/one eye on clock ---- > uninteresting
　　borrow ---- > lend // loan // use