Match the words from the box with the definitions. Then press "Check" to mark your answers.
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  1. [noun] the condition of being dependent on a drug or other, usually harmful, substance.
  2. [adjective] of great worth or value.
  3. [noun] complete destruction or decay.
  4. [noun] the act or process of completing.
  5. [noun] the continuous modification and adaptation of organisms to their environments through selection, hybridization, and the like.
  6. [noun] that which is supposed or taken for granted.
  7. [noun] the act of setting a course for or finding one's way to a destination.
  8. [noun] a careful study of something in order to judge it or measure it.
  9. [noun] the solid portion of the earth's surface.
  10. [noun] a resident of a country who is not a citizen of that country.