Once ______ , the plan can’t be changed.
She didn't go to the party last night, ______ she had to finish her term paper.
It's my great honor ______ to give a speech at the opening ceremony.
Once more I have to leave Beijing, ______ I have been living for eight years.
We all hold _____ belief that those who have ____wonderful sense of humor are more popular.
We met an old friend in New York ____our expectation. She waved at us ____ the street when she saw us.