1. I would use all those verbs except "guess" in that sentence.
The sentence also needs to have a different auxiliary verb with "fly" though. It needs to convey the possibility of flying, not the actuality of flying. "might fly" would get that across.
2 and 3 are correct and mean the same thing, yes.
1. Can you imagine people can fly to mars in the future?
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Can we use "believe, guess, suppose, think, and consider" instead of 'imagine?
2. Put on the helmet for safety.
3. Wear the helmet for safety.
(Are they all the same in meaning? Can we use both words, 'Put on and Wear' in this way?)
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