The president promised to keep all the board members _________ of how the negotiations were going on.
I told them not everybody could run as fast as you did, ______?
--Are you going to take part in the speech contest?---__________It's too good an opportunity to miss.
--- Would you mind not littering in the classroom? --- ______. I’ll pick up the waste paper.
The film Harry Potter Ⅳ is ______ for children above 12 and adults, for it contains horror and violence.
A turning point of the continuously high housing price won’t appear suddenly because there must be a certain process ______ many factors lead to the change.