—What do you think of the film? —It’s great. I have seen such a wonderful film before.
—What colour of the following represents “purity”? —______.
—Do you have any difficulty______ the work in two days?
—White doesn’t look good _______ you,but you look cool _____ black.
—The green bag reminded the old man _____ the days when he was young.
. —We find ______ impossible for us to learn a foreign language well in a short time.