—Hello, can I speak to Mr. Smith?—I’m sorry, but it is 3 weeks _____ he worked here.

It seemed only seconds ________ the boy finished washing his face.

— I told you that he would come to see you.— Actually I had little doubt _____ it was true.

Many of them turned a deaf ear to her advice, _______ they knew it to be valuable.

A total of 548 students fell ill ______ consuming milk and biscuits in schools in Northwest China's Qinghai province on Wednesday, local authorities said.