Mr. Wang would have continued to lead _____ poor life instead of changing his lifestyle if he hadn’t met Mr. Smith by _____ chance who was a businessman.
Many students go to school _______ the tube in Beijing every day.
It was two weeks before the Spring Festival and the shopping centre was _____ with shoppers.
Leave your key with a neighbor _____you lock yourself out one day.
—Bob has gone to California. —Oh, can you tell me when he ______?
Our plan to ______ a New Year’s party has won supports from our teachers.