—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
The incomes of skilled workers went up. ________,unskilled workers saw their earnings fall.
The further falling of the stock market as reported today has ________ a fresh wave of selling.
I'm interested in a single room. Do you have any ________?
I ________ on a sofa because my grandparents have been here to spend the weekend.
The Voice of China has set up a stage some people can achieve their dreams.