--Do you know any Russian? –Yes, but ___.
——John always thinks of others instead of himself.—— So he does. It is _______ of him to want to help others.
Scientific researches show that to _________ a language one had better often get exposed to it.
Recently a survey ____ prices of the same goods in two different supermarkets has caused a heated discussion among citizens.
With international ______ and education exchanges increasing every year, the number of Chinese students studying abroad has increased rapidly.
It is the first time that I _______ this kind of moon cake.