Complete the travel information for airline passengers in China with the verbs of obligation in the box. Some verbs may be used more than once: must, mustn't, should, shouldn't, are allowed, don't have to, has, is allowed.

For international flights passengers ¹___ check in at least two hours before departure. For domestic flights passengers ²___ really check in one and a half hours before departure but in fact, passengers often don't arrive that early. Most passengers ³___ to 20 kg of luggage. An airline passanger ⁴___ one additional item of hand luggage weighing up to 5 kg. But a passenger who has excess baggage ⁵___ to pay more. You ⁶___ pay extra for the airport tax - it is included in the price of the ticket. Not all ticket offices and travel agents in China accept credit cards, so travellers ⁷___ be prepared to pay in cash. Visitors ⁸___ show their passports when purchasing tickets. It is usual to ask for a reduction on official fares, and whatever price is first offered, travellers ⁹___ always ask for a discount. Children over the age of 12 ¹⁰___ pay the adult fare but younger children ¹¹___ be charged the full price. Ticket prices are more expensive between June and September and during Chinese holidays: the Spring Festival and the May and October holiday periods. On arrival, visitors ¹²___ complete a form for health, immigration and customs as part of Chinese regulations.