The Mekong River, which________ several countries in Southeast Asia, ______to be playing a significant role in the region.

We all joined the game______ Bill because he was hurt and had to stay in bed.

You won’t discover the truth ______ you look into the matter yourself.

Only by learning more about different cultures _______ avoid misunderstanding during international cooperation.

The fans never expected their favourite team, which owns so many excellent players, ________have been defeated in the first round!

_______ is well known is ________ the Diaoyu Islands have been part of China since ancient times.

At first I set out for the celebration with my friends together, but got _______ from them when we joined the big crowd.

Copernicus’s theory is now the basis ______ all our ideas of the universe are built.

With a MBA degree from Harvard University, our boss takes a______ method to manage the company, which benefits everyone a lot.

_______to sunlight for too much time will do harm to one’s skin.