1. Beijing is _____ capital of China and it is _____ city with many places of interest.
A. a; a B. a; the C. the; a D. the; the
2. The air in mountain areas is ____ that in big cities.
A. as fresh as B. fresher than C. as dirty as D. dirtier than
3. Keep practicing and you _____ your English.
A. improve B. will improve C. improved D. were improving
