下列各句中，没有语病的一句是( )

We are living in an age ______ many things are done on computers [ ]

The health official said ________ 12 suspected cases of H1N1 were tested negative and ________， so far, this city has reported no case of the virus.[ ]

Is everything settled? —Not yet. _____ I approached the problem, I couldn’t find a solution.

It’s helpful to put students in a situation _______ they can learn how to cooperate with each other.