I ___________come yesterday, but I couldn’t.
At the Copenhagen conference, all the countries were called on to do all they could to control greenhouse gas emissions________it was too late.
Mr. Smith’s decision to attend_________ceremony tomorrow can be seen as________gesture of his intention to improve ________the relationship.
You can’t complain of being lonely_______you don’t make any effort to communicate with others.
How long do you think _______ the computer company turns out a new product?
— Why do you look so angry? — He insists on my presence here, but I can see it makes no difference ______.