While she ........ about her childhood, she suddenly became emotional., is talking, was talking, talked, talk, He didn't knew how to swim when he was a child.  There is one mistake. Correct the mistakes., didn't know, doesn't know, is knowing, know, He....... how important family was after he moved abroad., relaizes, is relaizing, relaized, was relaizing, .......... you ........... your homework yesterday?, did / do , do /did, did/did, do/do, Marie Cruie ......... radioactive isotopes., isolate, isolates, isolated, is isolating.

past simple

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