—Silly me! I forget what my luggage looks like.—What do you think of _____ over there?

_______ was known to them all that William had broken his promise ______ he would give each of them a gift. 

Who can you turn to in time of danger, it not _____.

______ turned out that an army officer set off the bombs．

To save class time,our teacher has_______students do half of the exercise in class and complete the other half for our homework.