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9. Instead of ellipses insert a word which forms new words together with other words. What letter does this word contain?
  IQ test. Free iq test online # 1 with answers and solutions. Question # 9. What three-letter word can be added to each of these letters to make four-letter words?
 

Explanation:
The word "ALL" contains the letter A. (Tall, Fall, Gall, Pall, Mall, Ball, Call, Hall, Wall).