_______the people have become masters of their country _______ science can really serve the people

_____ the new policy, we are now having a happy life.

They _______ arrive at the station before 12 o’clock, but they don’t appear now.

She _____ the book sometime in the past as there is no way she could have answered the questions so accurately.

Mr. Smith found thatgas from the pipe when he cameback because we forgot to switch off. But at last we were lucky toescape .