Giúp em với ạ:::::::::::::::::::::::::::::::::::: 1. Gravity makes water run downhill → Water 2. People have believed that he kidnapped her. → He 3. You'd better explain the difficulty to him → The difficulty 4. Who gave you the gift? → By whom were 5. Whom did Pike tell about that yesterday? → Who was 6. Whom do you take out to dinner? → Who is 7. When did you send the school report to them? → When was the school report 8. People say that Arthur is very rich. → It iss said that 9. They think that he is very intelligent. → He is 10. I believe that you will work hard. → It is

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