下列各句中，没有语病的一项是（ ）

－Jim, is physics difficult to learn in high school－Sure. No subject can be learned well hard work.

f a beard is a sign of smartness, the_____ will be a Socrates .

Do you know ______ —Sorry. I don’t have a watch.

The price of pork has not been kept under control as expected, and _____ is more surprising is that the price has risen by 15% just in the past few months．