Bicycling is good exercise; ____, it does not pollute the air. 

I live in a faraway village, and only go to visit my parents ______.

Peng’s company makes __________700,000 yuan for each partnership it sets up and more importantly, benefits both local people and foreign countries.

It is generally believed that a successful Olympic Games            relies on well-performed IT services.

 After two years’ study, he now has a __________ better command of English.