Taiyuan, a city in North China, was struck by a heavy snowfall last week, ______ serious traffic problems

It is not easy to learn English well, but if you ________, you will succeed in the end. [ ]

Prices began to climb noticeably last year , _____a historical high in November.[ ]

The manager has _____to improve the working conditions in the company. [ ]

he program, they have to stay there for anothertwo weeks.