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London is the capital of Great Britain. It is a big city with more than twelve million inhabitants. It is one of the A_________ greatest cities and also one of the most visited cities in Europe. In 2016 the number of visitors to London hit a new record of 37,3 million. Like in many cities, transport is one of the B_________ problems. There is a lot of traffic, so it is sometimes C_________ to travel short distances on foot. The underground D_________ a huge area but it is more than 150 years old. A few years ago, the city E_________ making drivers pay to bring cars into the city. This has helped to reduce the traffic problems a bit.

A 1) world 2) worlds 3) world's 4) worlds'

B 1) biggest 2) big 3) most big 4) bigger

C 1) quick 2) quicker 3) quickly 4) quickest

D 1) covered 2) have covered 3) cover 4) covers

E 1) begins 2) began 3) is beginning 4) has begun