No one knows when or by whom rockets (a) ... In all probability the roc butd --over a long period of time, perhaps in different parts of the world at the same time. (a) i) was invented (ii) will be invented (iti) is invented (iv) were invented (b)) was not suddenly (ii) is not suddenly (iii) were not suddenly (iv) will not suddenly be (c) evolve gradually (ii) evolved gradually (ii) will evolve gradually (iv) evolving gradually fill in the blanks to complete the narration.
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a is the answer but this question is not understandable so according to me these the answer
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