She is a woman of great knowledge, _______ much can be learned.

Wang, I hear that you ______ along the Mekong RiverHave you got everything ready?

The rescue team didn’t leave until they were able tofind no ______ of life in the ruins after the destructive quake.

It may not be a great suggestion. But before ______one is put forward, we’ll make do with it.

Will you go to the World Expo in Shanghai by bullet train after the Examination—_______ I may go by air.