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10. Instead of ellipses insert a word which forms new words together with other words. What letter does this word contain?
  IQ test. Accurate and free online iq test # 3 with answers and solutions. Question # 10. Three-letter word.
 

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