单项选择题
A．When they are on holidays. B．On Sunday mornings. C．On Saturday night D．As soon as they have information.
A．The bus is less expensive than the train. B．The train is faster than the bus. C．The train is cheaper than the bus. D．The bus is slower than the train.
A．For half a month. B．A whole month. C．A week only. D．A week only.