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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