Explanation: Each row contains one Circle, one Square, and one Triangle (Constancy pattern). Row 3 already has Square and Triangle, so the missing is Circle.
Explanation: Shading increases by 25% each step horizontally (Progression pattern). 75% + 25% = 100% black.
It is notoriously difficult to cheat on. Your cultural background and language skills don't matter; only your raw logic does.