Word FormationÜbung 23 von 114

There is still no adequate (0) EXPLANATION (EXPLAIN) why, several thousand years ago, cultures in both Egypt and South America saw the (1) .......... (INTRODUCE) of pyramids. Was it coincidence? Many (2) .......... (SCIENCE) believe that it was, and state that there is no (3) .......... (POSSIBLE) at all that people…