--- How old are you, madam?--- If you _______ know, I’m twice my son’s age.
It is hard to imaginemore embarrassing occasion when you fail to understandsingle word said by someone.
— What’s the noise? It sounds as if it comes from upstairs. — ____ . It must be the window-cleaner working, next door.
Ten years ago the population of our village was that of theirs.
In our class, there are 46 students, half _____ wear glasses.
I have to go to work by taxi because my car_____at the garage.