Fill in the blanks, each using one of the given words or phrases

Fill in the blanks, each using one of the given words or phrases below in its proper form.
border on   in common   opt for   contribute to   what's more   be liable   accrue to   take into account   at random   fond of   be exposed to   draw a boundary around
Before deciding what to do, we must_________all the difficulties.
【正确答案】：take into account