He finds it hard to keep _____ with thechange of society if he stops learning

If they 　　　　earlier than expected, they 　　　　here now.

下列各句中，没有语病的一句是 ( )

―Excuse me, Sir, but could you tell me how to go to the railway station?―Sorry. You’d better ask, I’m afraid, ______ is a native.

If Newton lived today，he would be surprised by what ________ in science and technology. [ ]