Hint: to find out, Shake your phone. the poorly constructed building will collapse. (bridge will collapse)

Hint: People always breathed oxygen long before it was discovered. Click on the ‘Oxygen’ Word in the question text.

Hint: please write these numbers on a paper or memorize them first, because they will disappear after you press some of them.

Hint: 3 eggs will also take 4 minutes to boil (Put them in a bowl then boil once)

Hint: grab her handbag and give that to the boy, she will chase him :p, See image below:

Hint: π=3.1415, it is between 3 and 4. so make Pi by lowering the upper chopstick.

Hint: move the ring on the handbag to the golden ring above, see image below:

Hint: Shake the phone, real bord will fly away, that is the real bird.

Hint: you can easily find apple=10, Three banana=9, Ten grapes=10, So 4 banana +9 grapes= (3*4)+(1*9)=21

Hint: Press and hold the envelope with one finger then rotate the phone to right to remove the check from envelope using gravity. see below image: