Taiyuan, a city in North China, was struck by a heavy snowfall last week, ______ serious traffic problems.
| A．to face | B．faced | C．having faced | D．facing |
Professor Smith will come here to give a speech. All the preparations must be _____ before 5 o’clock.
| A．in time | B．in sight | C．in place | D．in control |
---Is everything settled?
---Not yet. _____ I approached the problem, I couldn’t find a solution.
| A．Whatever | B．However | C．Whenever | D．Wherever |
The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health.
| A．involved | B．being involved | C．having involved | D．to be involved |
With the final exams coming, Mark, the top student in our class, is not worried about Chinese, and _________ English.
| A．still more | B．at least | C．least of all | D．better than |
It puzzles the scientists _____ some mammals produce their young _____ others lay eggs.
| A．that; while | B．what; while | C．that; as | D．what; as |