If you heat butter, it _____________, will melt, melts, If she _____________ hard, she will pass the exam, studies, studied, What would you do if you _____________ a spider in your bed?, saw, 'd see, If Tony had saved some money, he _____________ travelled to Paris last summer., would, could have, If I had known you were in hospital, I _____________ you., would visit, would have visited

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