下列各句中,没有语病的一句是(　　)

The sick man’s allowed to take a walk in the gardenevery day, ________ — Yes, I think so.

boxes are muchmore in the UK than in the US, where most people have a mailbox instead.

The health official said ______ 12 suspected cases of influenza A (H1N1) were tested negative and ______, so far, this city has reported no case of the virus

The newspaper says if more underground lines nextyear, it will be much easier for people to travel around Nanjing.