The top leaders of the two countries are holding talks in a friendly _________.
I feel greatly honored ____ into their society.
In his book,he explains both ______ it means to be a scientist and ______ science works.
The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
______ giving up, he went on with his research,got his PhD and married the girl.
Think twice before you make a decision on this matter. It will make ______ to your life.