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Complete the dialogue. Use was, were, wasn't, weren't.
Inna- (1) ... Aleksander Belyayev a scientist?
Ilya- No, he (2) ... . He (3) ... a writer of science fiction novels.
Inna- What (4) ... his famous books?
Ilya- He wrote The Amphibian Man and Professor Dowell's Head. I don't know about his other books- I think they (5) ... very famous.