Answer:
I come with a train and go with a train and the train doesn't need me but can't go without me.
I am just two and two. I am hot. I am cold. I am the parent of numbers that cannot be told. I am a gift beyond measure a matter of course. I am given with pleasure when taken by force.
Sometimes I annoy you, sometimes you can't live without me. But no matter how hard you try, you can't destroy me. What am I?
I say everything I hear to others around. Iβm not an animal nor part of the human race. I will immediately repeat after you; But only if my tail is in place.
I go in dry and come out wet. The longer I stay in the stronger my surroundings get.
I flow from the Homerβs mouth when he sees doughnuts.