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Budapest is one of the most beautiful cities in Europe. Its many attractions include the Children's Railway, which is different from other railways because this train line (A1) ... by youngsters aged 10 to 14. It (A2) ... passengers through the beautiful forest parks of the Buda Hills ever since it (A3) ... up in 1948.
Today, the railway (A4) ... approximately 300,000 people a year on the 11-kilometre journey through the hills. Only young people who (A5) ... successfully a special four-month training course are allowed to work there. The railway operates daily, and the young workers have to take one day off school every two weeks to participate. As long as their schoolwork (A6) ..., their involvement is encouraged. Similar railways have been set up in other parts of the world, including Russia and Bulgaria, but the Budapest Children's Railway remains one of the largest and most popular trains of its kind that (A7) ... passengers.
2) would complete
3) had completed
4) are completed
Пропущенный глагол обозначает законченное действие, время совершения которого не важно, важен результат. Поэтому нужна форма настоящего совершенного времени, Present Perfect. Правильный ответ have completed.
Правильный ответ указан под номером 1.