What do you do on stage 4 of questionaut

You have to answer at least 5 questions correctly, without missing any, to complete each of the 8 stages by filling the balloon with bubbles. A correct answer gives you another bubble. An incorrect answer will take away a bubble.

To start the stage:
Use the dangling key to open the first drawer (soccer ball). Use the key under the mouse to open the second drawer, which has a box. Click the box to find the next key. Open the drawer that has the glass of juice, and the mouse will drink it. Click him to ask questions.