Hurry up, __________ we will miss the train.
I can't understand why he ________ so selfish. He isn't usually like that.
Jack decided to risk looking for a place to stay where he arrived, rather than booking ______.
______ good knowledge of several languages is essential to _____ study of comparative literature because without it one can read books only in translation.
I should not have laughed if I you were serious.
—Shall I attend my friend's comingofage ceremony, Mum?—No, unless you see to ________ that you will be home before 1000 PM.