Around the world smart cities are being built while those we have lived in for centuries are being upgraded for the future. A smart city may mean one that uses data on traffic to ease congestion or one that aims to 1) ____services to provide better information for citizens. For many it is about making cities greener and more efficient. It is partly a 2) ____to overcrowding and pollution and partly because in an ever-connected world it 3) ____to hook entire cities up to the network. Masdar is a city that stands in the middle of the desert of Abu Dhabi in the United Arab Emirates. It is designed to be one of the most 4) ____cities on the planet. With a solar power station at its heart and wind farms providing energy for it, it 5) ____to be carbon free. Everything in the city, from water to rubbish, is measured and 6) ____, becoming a source of information. The city is built on a raised platform to allow its “digital plumbers”, easy 7) ____the system of advanced technologies that run it. It is pedestrian-firiendly and entirely car free. The city is 8) ____a network of electric driverless podcars. The PRT - personal rapid transit - will run six meters under street level across the city. The buildings in the city have been designed by Norman Foster's architecture firm, which designed a number of 9) ____buildings including The City Hall in London. It is hoped that 40,000 people will eventually live in the city, with up to 50,000 10) ____there each day.