lt's p_that l'ii go walking instead of swimmingmany stories told how brave dogs helped people in t.lt was sent up in a manmade earth satellite in 1957 by R_scientist.dogs can hand s____better than man ,but they can not see so well

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lt's p_____that l'ii go walking instead of swimmingmany stories told how brave dogs helped people in t______.lt was sent up in a manmade earth satellite in 1957 by R_____scientist.dogs can h____and s______better than man ,but they can not see so well

lt's p_that l'ii go walking instead of swimmingmany stories told how brave dogs helped people in t.lt was sent up in a manmade earth satellite in 1957 by R_scientist.dogs can hand s____better than man ,but they can not see so well