After chatting on QQ a long time, Mary looked up, ________ that it was 11:00 pm, long past her usual bedtime.
I would love _______ to your birthday party last night, but I had to attend an important meeting.
Since you have made such good preparations,there _______ be any problem about passing the coming exam.
My new novel has disappeared.Who _______ have taken it?
—The winner of the race is a tall and thin boy with thick glasses. —Then it _______ be my friend, Mike, who looks like a “meat ball”.
I am glad that you have managed to come.You _______ have brought wine.We’ve got plenty.