Mary made coffee ________ her guests were finishing their meal .
The moment the World Expo ________ open, the whole audience cheered.
After graduation, he got an opportunity to go to America for further education, and all his friends envied ________. In other words, his good luck is ________ of his friends.
Peter ________ to evening classes since last month, but he still can’t say “what’s your name?” in Russian.
They ________ for two years and haven't been in touch with each other for a long time.
Today,we will begin______ we stopped yesterday so that no point will be left out.