As is known to us, theory is based on practice and servers practice. A. by chance B. in turn C. in return C. by turn
Because of the rain, we’ll have our P.E. class in the classroom _____ the playground.
A flag is _____ a piece of cloth. It stands for a nation’s people, their land and their history.
—_____ I invite Jack to the party? —Yes, it’ll be nice if you _____.
The couple _____ for thirty years.
Her question was so difficult that I could hardly make any ____ of it at all.