Refuerzo semana santa

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Completa las frases con must, can't o might.
A: I'm going to climb the Himalaya next summer.
B: But you are seventy years old! You____  be serious. You____  be mad.
A: It ____ be wonderful to be up there and have the entire world at your feet. It would be a dream come true.
B: But you____  have an accident or get killed. I don't think it's wise to take the risk.
A: Young man, your life______  be much fun if you never take risks. You should do it from time to time. You______  enjoy it!
B: Enjoy it! You_______  be joking. You  never come back from this adventure.