下列各句中，没有语病的一句是（ ）

Your school things are here and there. Will you please ________—OK, I’ll do it right away.

He knows so much about Russia that he’s universallyacknowledged as a _____ on Russian affairs.

The reason _______ he was late againwas that he was caught in a traffic jam in the rush hour.

I’m certain David’s told you his business trouble ________, it’s no secret that he owes a lot of money to the bank