Let’s go to the library this afternoon, _____?
---Is everything settled? ---Not yet. _____ I approached the problem, I couldn’t find a solution.
The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health.
With the final exams coming, Mark, the top student in our class, is not worried about Chinese, and _________ English.
It puzzles the scientists _____ some mammals produce their young _____ others lay eggs.
Many Internet users make _____ most of the half-price promotion and it is _____ good opportunity for online shopkeepers to get their names known.