Ex1 : điền vào chỗ chấmThe 10 most expensive cities in the world have been named . The 3 that are at the top of the list are Singapore , Zurich and Hong Kong . If you decide on(1)................... them , be warned . These are the places (2).................. people pay the most for basic necessities , not just luxuries . There are various reasons why a city can be expensive . One is that the average salary is high . When that's the case , everything else costs more too . So even if someone(3)................. a good living ,the have to spend more to get what they need . While the Swiss , for example , may be(4).................. to their high prices , visitors are not . Tourists hoping to get a barhainon a Swiss watch or a cuckoo clock are likely to be disappointed , even if they shop around are compare prices . Travellers don't(5)................... make expensive purchases , of course , but a holiday isn't much fun when you can go bankrupt essentials like bus tickets , restaurant meals and museurm entry fees .