1. Used frequently, this machine lasts longer. - Because it is used frequently, this machine lasts longer., 2. Having completed the homework, Mark went out to play. - After having completed the homework, Mark went out to play., 3. Having been repaired, the car runs very efficiently. - Since it had been repaired, the car runs very efficiently., 4. Hearing the news, she burst into tears. - Upon hearing the news, she burst into tears., Knowing the risks, they decided to proceed with the experiment. - Since they knew the risks, they decided to proceed with the experiment.,

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