John fell asleep ______ he was listening to the music.A.after B.before C.while
the new underground is available has not been made clear yet.
It's a common _______ for young people to pay a New Year's visit to their elders.
—Would you mind giving your advice on how to improve our business management? —If you make ____ most of the modern equipment, there will be ____ rise in production.
---Have all the mysteries been cleared up? --- Almost. But ______ only one question ______.
I will never forget my stay there I found my lost wallet.