Question: Italy takes over the Presidency of the Council of the European Union A Customs Union between EU and Turkey enters into force
Please fix the punctuation.
Fixed: [Italy takes over the Presidency of the Council of the European Union. A Customs Union between EU and Turkey enters into force.]

Question: For example governors and city mayors previously had been elected by their electorate but the new constitution gave the President the power to appoint such officials
Please fix the punctuation.
Fixed: [For example, governors and city mayors previously had been elected by their electorate but the new constitution gave the President the power to appoint such officials.]

Question: Heat olive oil in a deep skillet over medium heat
Please fix the punctuation.
Fixed: [Heat olive oil in a deep skillet over medium heat.]

Question: Clean the potato thoroughly under tap water with a hand brush puncture it repeatedly from all sides with a fork
Please fix the punctuation.
Fixed:
[Clean the potato thoroughly under tap water with a hand brush puncture it repeatedly from all sides with a fork.]