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Scientists ___________ invented medicines to cure many diseases.

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Daya ____________ waiting for one hour when I went there.

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I ________ grammar now.

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I ______ (thank)him for what he ________(do) for me.

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The President ____________(go) to Malaysia next week.

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He has helped me many times since he __________ here.

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He _____________ changed a lot.

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I ____________ already gone before they came.

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Anju ____________ arrived yet.

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What _____________you doing when he came