Complete the proverb: "A new ___ sweeps clean"?

A new industry in Europe began after Andreas Marggraf discovered what in beets in 1747? Which New Mexico community and national lab were ravaged by a fire that began as a controlled burn on May 4, 2000? A New Mexico state park is named for which bandit, who raided U.S. territory there in 1916? In which 2011 sitcom did Christina Applegate play new mom Reagan Brinkley? Mexico created a new one of these in 1917, but its part threatening property rights proved hard to enforce. What? Which New Orleans dessert is called Bananas...? A new play based on which Sir Arthur Conan Doyle canine classic opened on the London stage in 2007? A U.S. president elected in 2008 would finish a first term in January of which year?