Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. Note that you will lose points if you ask for hints!
N.B. benefit from = advantage received because of something's existence or action benefit by = advantage recieved due to a given action complain of = a problem a person is saying to have complain about = the topic of the complaint is specified consist of = composed of, made up of consist in = the thing mentioned is the most important; based on or to depend on something