单项选择题
A.20 paid holidays each year. B.30 paid holidays each year. C.40 paid holidays each year.
A.money for the program. B.money for at least three of their own employees. C.a special price.
A.Heathrow Airport provides free pickup service. B.Heathrow Airport and local destinations are connected by free train services. C.Free train services connect the terminals of Heathrow Airport.