The students are going to clean up the mess while the food is cooking in the pot.
The introduction I would say because in your introduction you use a grabber which should grab the attention of your readers. But also maybe your first body paragraph... it all just kind of depends on how YOU want to structure your essay.
Hey there, MotoGalaxy!
I would say B, calculator : add :: net : snare because a calculator is an object which makes the function of adding. Same as the net.
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I washed your t-shirt because it was oily.