We should try our best to __________those people after the disaster.

China needs to strike a balance between maintaining a ______ fast and stable development and economic structural adjustment.

More than two hundred years ago the United States _______ from the British Empire and became an independent country.

Can I have a talk with you at about 4 this afternoon，Mr Black—All right，I ________from a conference by then.I will be waiting for you.

About ________ of the teachers in our school were born in ______________.