I am struggling to know when to accept pronoun ambiguity. For OG-12th edition-question 57 the correct answer reads "It can hardly be said that educators are at fault for not anticipating the impact of microcomputer technology: Alvin Toffler..." The "it doesn't refer to anything---Why is it not wrong?
Then for OG 12-edition question 52 the correct sentence reads "Long before it was fashionable to be an expatriate, Josephine Baker made Paris her home, and she remained in France during the second world war...."
Again the it doesn't refer to anything.
Please help explain when is it okay to start a sentenece with a pronoun??