Misc: Which group recorded the albums Regatta de Blanc and Ghost in the Machine?

Questions

What is the English name for what Americans call confectioners sugar?

In 2000, which author released his novel 'The Plant' on the internet?

Traditionally, witchetty grubs are eaten by which people?

The Mariana Trench is the deepest part of which ocean?

The saints Clare and Francis are associated with which Italian town?