The doctors in Beijing did all they could______ Shao Zhanwei, mayor of Hangzhou, but he still died of heart attack at the age of 58.

I enjoy _____the western food and I often make some for my parents.

It’s time for class. So stop ________, please.

My parents asked me ______ my sister with her schoolwork.

Sir, would you mind not _____ here, please?

Our teacher often tells us ________ too much time watching TV.

--- Tom is one of _________ students in my class .
--- Yes . He usually prefers _________ at home to playing outside .

-- The math problem _________ is not difficult.
--- But after several tries , I have to give up _________ on it .

My uncle is used to        for the children in poor areas.

Our teacher told us          in the class.