riddle  - a question that is difficult to understand, and that has a surprising answer, that you ask somebody as a game, a device  - an object or a piece of equipment that has been designed to do a particular job, nonetheless - despite this fact, gap - a space where something is missing, to reproduce  - to make a copy of a picture, piece of text, etc., gradual  - happening slowly over a long period; not sudden, insight  - an understanding of what something is like, vertical  - going straight up or down from a level surface or from top to bottom in a picture, etc., military  - connected with soldiers or the armed forces, vital  - necessary or essential in order for something to succeed or exist,

Reading explorer 4 engineering

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