—I’m afraid you missed a fantastic lecture yesterday. How come you were absent from it?—If you _______ know, I asked for a day off and visited a relative of mine in hospital.
There was a terrible noise _______the sudden burst of light.
When I handed the report to John, he said that George was the person______.
I’m thirsty. Would you please give me something________.
Do you consider _______any good attempting many scientific experiments?
I can’t help _______the house because I’m busy making a cake.