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When I was I child I used play with paper planes, I made this with my hands and a piece of paper that I fold and blend, always trying to make a triangule and at the last making the wings. Next I palyed with my friends race of paper planes.

Hello!!
My answers:
When I was a child, I make a city of paperboard. I used cardboard and paper sheets, glue, toes, and crayons. First in a sheet of paper I drew the streets after I built the houses and buildings with the cardboard sheets, finally I colured with crayons.

!!Thanks for your attention!!

My answers:

1. The idea is polish the can of soda with the chocolate bar, after that you can put a sheet of paper or matches for the sunlight begin the fire.

2. You can rub two rocks or wooden sticks, for two minutes, better if the weather is sunny and the fire begin, you are carefully with the wind, if this is strong, it can ended the fire.

3. For make a shelter you can find wooden sticks, rocks and sheets of straw, first, put the rocks in the grown after that the wooden sticks, and finally up the sheets of straw, the rocks help to hold the structure to the wind.

4. For signal for help the people can used fire, or gunpowder, in the sea when the people lost, they can put a sheet of paper in a bottle, for somebody can read the emergency message.

!!Thanks for your attention!!

Thanks for your answers Jaime! Can I help?
The idea is polish the can=.. is to polish the can
after that you can put a sheet of paper or matches for the sunlight begin the fire= Here you can say: You use the can to reflect the sunlight onto a piece of paper. After some time the paper will catch fire. The verb is " to catch fire" or "to start burning".
you are carefully with the wind, .= Be careful if there is a wind.
if this is strong, it can ended the fire= If it is strong, it can blow out the fire. To blow out a flame, a light, a fire.
See you!
Pieter

Thanks Pieter!!