Passive voice Câu 1 : The robbers ......... since last Monday. A.have arrested B.have been arrested C.were arrested D.are arrested Câu 2 : Did they ........ this house in 1990? A.build B.was built C.has built D.built Câu 3 : Gold ........... in California in the nineteenth century. A.was discovered B.has been discovered C.discovered D.are discovered Câu 4 : My son ........ games for two hours. A.played B.is played C.has played D.has been played Câu 5 : Meals ........ by Hoa every day. A.cooks B.cooked C.has cooked D.are cooked Câu 6 : My father waters this flower every morning. => This flowers Câu 7 : John invited Liz to his birthday party last night. => Liz Câu 8 : Our teacher have already explained the English drama. => The English Câu 9 : Did Mary buy this beautiful dress? => Was Câu 10 : The German didn't build this factory during the Second World War. => The factory

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