—Have you seen Mr. Smith?—Yes. Look, he _________with a parent in the office.

It _____ last week that the haze(雾霾)in Beijing caused many problems.

 His father           Beijing. He is staying there for two days.

— What do you think of the young lady?— She is hard-working. She ________ all her effort into her work before she got ill. 

When my mother ______ home, I was making some cards.