above all - most importantly
　　account for - explain

　　as a matter of fact - in fact ,to speak the truth

　　as a rule - generally ;normally

　　about to - be ready to; be on the point of doing something

　　an old hand - be an experienced person

　　any day now -soon

　　approach sb -talk to sb

　　be fed up with - be out of patience with

　　be on one's own - live independently

　　be on the safe side - take no chances

　　be out of something - have no longer in supply

　　be tired of - be bored with ,frustrated with

　　be up to ones' ears - be extremely busy

　　be up to someone -be a person's responsibility

　　be out for -trying to get

　　be out of the question - be unacceptable ,impossible

　　bite off more than one can chew - take on more than one can handle

　　break down - cease to function

　　break the ice - begin to be friendly with people one doesn't know

　　break the news - inform or give bad news

　　brush up on - improve one's knowledge of something through study

　　bump into - meet unexpectedly

　　by and large - in general

　　by heart - by memory

　　by all means - absolutely ,definitely

　　by no means - in no way

　　call off -cancel

　　cheer up - be happy

　　come down with - become sick with

　　come into -receive, especially after another's death

　　come up with - think of

　　count on - depend upon

　　count out - eliminate