In this stable weather conditions, the pollutants in the air are not easy for outward diffusion, so that the pollutants __________ in the atmosphere to make the air worse.
There came a point in his life____ he had to think about seriously about his future.
The old lady is said to have three children,two of ____studying abroad.
He had planned to make a compromise,buthe changed his mind at the last minute.
Security was such a major concern at the conference that no journalists could approach the meeting zone without ________ the special pass.
—Mary, are you sure your aunt ___ back from America? —Yes. My mother ___ me. I am going to see her now.