The question that puzzled us is _____ wecan get rid of the air pollution in the area.

anning to go to Kingdom of Cambodia this summer vacation. I think the trip will be exciting.—___________, as it’s the rainy season then.

Wealth is important but as a matter of fact , I think , _____ is health that counts.

Not until he retired from teaching three years ago ________ having a holiday abroad.

Although Yao Ming has been a famous star in NBA, he still _____ everything which happened in China.