Without facts, we can't form a worthwhile opinion, for we need to have factual knowledge ______ our thinking.
I suggest that that we should take part in more such activities in future _______we did yesterday.
You may depend _________it won’t happen again.
He often keeps English _______ ___________,
— Did you scold him for his mistake? — Yes, but _____ it.
It will be five years ____ we meet again.