Add the letters A, A, A, C, G, I, I, L, L, N, P, P, R, R, S, S, S, T, U to the blank spaces on a one-to-one basis, so that, together with the letters already on the board, ten words are formed, five horizontally and five vertically in crossword fashion.
From Mensa Puzzle Calendar 2018 by Fraser Simpson, Workman Publishing, New York. Puzzle for August 15.