1. The missile is being launched upward into the sky
-> upward
2. I'll only help you with you promise to try your best
-> Only if
3. Her grief was so great that she was almost fainted
-> So
4. I would help the poor if i were rich
-> Were
-> towards the sky you will see the missile launch. -> Only when you promise to do your best, I will help you. -> Because of that her pain was so great that she almost fainted. -> So I will help the poor if I am rich.