11.Be aware of:意识到
   
    I like people who are going about their daily business without being aware of the camera(1997-1)
   
    12.Behind the schedule/late
   
    13.Be in charge of:负责，照顾，经管 be responsible for
   
    14.Be in the charge of:下级+be in the charge of+上级
   
    15.Be in season:应季的，当令的
   
    These apples and pears seem to be in season.(1995-6)
   
    16.Be supposed to do:应该，被期望
   
    What am I supposed to do with his help?
   
    17.Book up
   
    Break down/doesn’t work
   
    18.Bring up:教育，培养，提出
   
    She brought up her children to be truthful.
   
    19.Build up积累，增强，树立
   
    20.By chance/run into:偶然