How do you complete level 5 on questionaut

To start the stage:
Click the icicle and place it into the flask so that it tips over
Rotate the valve 2 times to the left to start the gas
Click on the match box
Click on the match box to obtain a match
Use the match on the 'striker' of the match box to light it
Light the burner
When the plug lifts, click the skater to start the questions

You have to answer questions correctly to get bubbles (fuel). Correct answers get one bubble and incorrect answers lose one. You need 5 bubbles to advance to the next level. (There are always some very easy questions included in the random selection.)