The sales _____ steadily, the factory needs an increasing supply of raw material.                                                   

 _____________ on the portrait, mother was deep in thought.

(2014·山东实验中学一模)With his attention________on his mobile phone，he didn’t notice his headteacher’s appearance.

Whether you believe it or not, it is _________ that causes your illness.

The subway was crowded with passengers going home from market, most of _____ carrying heavy bags and baskets full of fruit and vegetables they had bought there.