30. what is the english flag called? a) union patric b) union jack c) lines and crosses 31. what is the london underground called? a) the tube b) the metro c) the subway 32. who is the head of state in britain? a) the mayor b) the queen c) the prime minister 33. what is the river in london? a) thames b) london c) avon 34. what is the most expensive part of london? a) west end b) east end c) the city