Before a problem can be solved, it must be obvious ______the problem itself is.
My mother is __________ a piece of meat.
More and more people were gathering there. He __________ his way through the crowed and rushed into the burning house.
— Won’t you stay for lunch? —No, thanks. I __________ my uncle at the airport at 10:30.
Mr Black __________ Shanghai in a few days. Do you know when the earliest plane __________ off on Sunday?
—A new film will be on tonight. Will you go to see it? —If you don't go,__________.