Choose the letter of the word or group of words that best completes the sentence.
  1.      _____ the earliest system of writing.
  (A) The constitution of pictograms
  (B) Pictograms in the constitution
  (C) Constitute the pictograms
  (D) Pictograms constitute
  2.      At temperatures _____ absolute zero, substances possess minimal energy.
  (A) approach
  (B) approaches
  (C) approaching
  (D) they approach
  3.      The Earth’s one-year revolution around the Sun changes how _____ on one hemisphere or the other.
  (A) falling sunlight
  (B) the fall of sunlight
  (C) sunlight in the fall
  (D) sunlight falls
  4.      Though sporadic interest in regional dialects _____ for centuries, the first large-scale systematic studies did not take place until the nineteenth century.
  (A) has existed
  (B) it existed
  (C) has it existed
  (D) existing with it
  
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