He ___________busy yesterday, or he __________you with your experiment.
______ sculpture is to a block of marble, education is to a human soul.
Each member country of WTO must ______ its laws and regulations and compete on the principle of fairness and co-operation.
---- Do you know why the sun looks much bigger on the horizon? ---- Well, well, ______. I’ ve never read about that.
Graduates of 2009 share ______ fate of entering the work force at a bad time, when the world is sinking deeper into ______ financial crisis.
—Are you still very busy? —Yes,I ______ the report for the manager and it won’t take long.