Television: Who hosted Sale of the Century from 1991 to 2001?

Questions

The Venetian island of Murano is particularly associated with the manufacture of which product?

The US Congress comprises the Senate and which other house or chamber?

Birmingham is flanked by the M6 on the north and M5 on the west, which motorway flanks south & east?

How many senators comprise the US Senate?

In which North Italian city is a world renowned opera season held annually in the Roman arena during July and August?