—Have you been to the Great Wall?—Perhaps not in my memory; ____, it might have been during the early childhood.
Water, which seems so simple and common, is ______ makes life possible.
Let’s go to ______ cinema—that will take your mind off the problem for while.
With a lot of difficult problems________, the manager felt worried all the time.
I have been keeping the portrait ________.I can see it every day, as it always reminds me of my childhood in Paris.
The driver began to speed up to ________________ for the hour hed lost in the traffic jam.