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She ( ) to Pairs, hasn't she? (go)Yes.How ( ) she ( ) there? (go)She ( ) there by air. (go)

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So far, many countries ( ) their software programs. (develop)

Mr Chen ( ) up smoking last year. (give)

Mr. Chen ( ) up smoking since last year. (give)

We haven't seen each other ( ) a long time.(for, since)

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