The pollution in Beijing is expected to improve, ________ a series of air pollution control measures.
The number of people invited __________ fifty, but a number of them __________ absent for different reasons
We all thought ______ a question ________we could raise enough money for the project.
It is theability to do the job _____ matters not where you come from or what you are.
I hate___ when people talk with their mouths full.
I was only when I reread this poems recently _____ I began to appreciate their beauty.