题目内容

Traditionally, travel groups often hire ____to conduct their journeys, especially when the journeys are not too long.

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Trains are ____to planes in that railway terminals are often in the centre of the destination while airports are often located 20 or 30 kilometers away from the centre.

The load of ____flights (of 90% or more) is usually higher than that of scheduled ones (which can be as low as 20%).

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