— There is________on using mobile phones at the gas station.— Do you mean talking on the mobile phone________at the gas station?[ ]

How about dinner tonight It’s on me.— ______ .

Who should be responsible for the accident? -The boss, not the workers. Theyjust carried out the order.[ ]

To win in these areas, the firm needs a sustainable __________ advantage.

Great changes _____ in my hometown since 1980.