1) If you mix red and blue 2) If you mix blue and yellow 3) If you mix red and yellow 4) If you drop something 5) If your phone battery dies 6) If the power goes out 7) If you press this button 8) If you install the app 9) If students study 10) If the bell rings

Zero Conditional 2

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視覺風格

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恢復自動保存: ?