填空题 Write the missing words. Use one word only in each space.
Before you travel to the US, you (must) find out what documents you need. British people do not {{U}} {{U}} 10 {{/U}} {{/U}}to get a visa, but there are different rules for different nationalities. For example, you {{U}} {{U}} 11 {{/U}} {{/U}}need to show that you have enough money with you. But there's one rule you can be sure about: everyone {{U}} {{U}} 12 {{/U}} {{/U}}to show their passport. The roads in New York are very busy, but don't worry—you {{U}} {{U}} 13 {{/U}} {{/U}}get around cheaply and easily by subway. Remember that you are not {{U}} {{U}} 14 {{/U}} {{/U}}to smoke on public transport or in shops. And don't forget either that you are {{U}} {{U}} 15 {{/U}} {{/U}}to tip taxi drivers and waiters. New York is not the most dangerous city in the US, but you really {{U}} {{U}} 16 {{/U}} {{/U}}walk along empty streets at night. And it is safer if you are {{U}} {{U}} 17 {{/U}} {{/U}}to travel around in a group.