13.     Air and water _______________can make people fall ill. (pollute)

14.     We should make our world ___________________. (pollute)

15.     You may face a ________________or termination of benefits. (reduce)

16.     Without practice, hopes will be _________________to zero. (reduction)

17.       She is a very helpful and ____________ woman.                            (energy)

18.  _______________, the student couldn’t answer the examiner’s question exactly. (disappoint)

   19.  Every citizen may claim the ________________of the law. (protect)

20.     Trees should be well _____________from the cold during winter. (protect)

21.     The drugs work well at first but gradually lose their ______________. (effective)

22.     The company must reduce costs to compete _________________. (effect)

23.     Food, clothing and shelter are all basic ________________of life. (necessary)

24.     In writing this report, I have omitted all ___________________details. (need)

25.     Does that machine work ______________?  (effect)