1 participate 2 access skill 3 expand something 4 cause 5 source 6 challenge 7 opportunity used 8 consumption do or a) make something happen b) a new or difficult task that tests somebady's ability and c) the opportunity or right to use or see somebody or d) take part in e) a place, person or thing that you get something from ) to become greater in size, number or importance 9) the act of using energy, food or materials, the amount h) a time when a particular situation makes it possible to achieve something
