Question 81: If oil supplies run out in 2050 then we need to find energy sources soon.
A. alternate B. alternating C. alternative D. altering
Question 82: The players' protests no difference to the referee's decision at all
A. did B. made C. caused D. created
Question 83: Peter, Harry and Chuck were the first, second and third _ in the school cross- country race.
A. respectively B. actively C. responsively D. tremendously