In autumn, it's beautiful outside with golden fallen leaves __________ the ground.
It is necessary to explain your theory _____, otherwise the audience won't make sense of what you are trying to get across.
______the weather, our school sports meet has to be held in the indoor stadium.
_____entering the classroom, remember to take your seat and turn off your cell phone.
(2014届浙江省宁波市十校高三3月联考英语试卷) In such a background, his white hair was particularly his dark skin.
______ difficulty, you can reach me at this number. I’m always at your service.