Bài tập passive voice

<ol><li>Who wrote this novel?</li><li>When did they build the bridge?</li><li>Where will they hold the meeting?</li><li>Why are they questioning him?</li><li>What did she buy yesterday?</li><li>Who teaches you English?</li><li>Which company produced this software?</li><li>How many people visited the museum last week?</li><li>When will they announce the results?</li><li>Who helped you with your homework?</li></ol>