1) 1. What________? a) the first people landing on Mars will see b) will the first people landing on Mars see c) the first people landing on Mars see 2) Once you start the trip between the stars, you_____ be able to stop along the way a) wont b) want c) won't 3) Breathing Mars's atmosphere ________ easy a) will not b) will not be c) be not 4) Will tourists________ special astronaut training in the 25th century? a) need b) won't need c) be need 5) When a shuttle is above 100km high, astronauts can float in the air and enjoy_______. a) spaceships b) satellites c) zero gravity

space

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