Li Na had managed to ______ in motion an upsurge(高涨)of students learning tennis across Asia.
Our teacher entered the classroom, __________.
–What do you think the noise was? --It ___________ a cat.
Do you know the _________ of the saying I just quoted?
He is very stubborn, it is impossible to argue _____________ what he doesn’t want to.
It was playing computer games______ cost the boy plenty of time_____ he ought to have spent doing his homework.