The air pollution is serious, ________ we must try our best to reduce it. A. so B. or C. if
It’s _________ hard problem for the twins that ________ of them can work it out .
______ of that country _______ by snow.
The more books you read, the ______ you will feel.
--- Is Li Ming in the classroom? --- No, he there. I saw him in the reading room just now.
---Amy had nothing for breakfast, _________ she? ---_______. She had some bread and milk.