1)My room (was, were, had) very messy and my mum told me to clean it. 2)When she came home, he (had been practising, practised was practiced), for two hours.3) She (was taking, were taking, had taken) him home yesterday at noon.4) Jane (were helping, had been helping, helped) me with my homework yesterday.5) It (was, had, was been) a very harmful experiment.​