1. Beijing,        (作为中国首都) ，is rich in cultural and historic relics.

8. Your work has improved;we are all pleased with your progress. Keep it       

7. We are glad that he substituted        our English teacher.

6. The air quality in the city,      is shown in the report,has improved over the past two months.

5. Steve Jobs passed away at the age of 56 ,       spirit will forever be the treasure of Apple.

6. Last summer we visited the West Lake,for        Hangzhou is famous in the world.

5. After graduation,I decided to stay in Chongqing,        I was born.

4. Finally we visited the Giant Yangtze Gorges Dam,        is the greatest water control project in the world at present.

3. Our guide,      was a French Canadian,was excellent.

2. The boy,      father is an engineer,studies very hard.