I’m tired out．I stayed up the whole night, ______ for my midterm math exam．

_____ with out girls, she is more active in class.

With many major economic problems________ to be solved, there is no point predicting the growth rate of this year now.

The brave solider was willing to risk ______ his life rather than ______ himself up to the enemy.

_____around the Water Cube, we were then taken to see the Bird’s Nest .