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He has helped me many times since he __________ here.

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What _____________you doing when he came

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Scientists ___________ invented medicines to cure many diseases.

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He _____________ changed a lot.

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The minister ____________ with an accident last month.

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The teacher _______________ many questions since she started the class.

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He is ______________.

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Ramu __________ working in this firm for 3 years.

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He __________ asleep while he was reading.

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I ____________ already gone before they came.