Change the sentences from the passive from into the active form
1. Ha Noi Flag Tower was construction in 1805 and renowned as one of the symbols of Ha Noi
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2. The People's Committee Building of Ho Chi Minh was designed by Gardes
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3. Tourist are always surprised by the beautiful landscape in Da Lat.
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4. Po Rome Tower was built in the 17th century on a high hill in Ninh Phuoc.
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5. The old stone field of Nam Dan was investigated in 2004 by scientists from the Institute of Archeology.
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6. So many visitors are attracted by Old Streets over the years
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