celebration of the university’s 100thbirthday, he said, “I have never experienced __________ time here as a graduateof Tsinghua University.”

The ____ is just around the corner and you won’t missit.

How time flies ! Several years _____ since we last metat Jack’s Party.

Social __________ are greatly different from country to country. Remember “When in Rome, do as the Romans do.”

We must plant more trees after we _____ every year.