______ once every two years, whether it is a car, a bus or a lorry, is the rule that all drivers must obey in our country.
The house rent is expensive. I’ve got about half the space I had at home and I’m paying ________here.
She went to the bookstore and bought _________.
It is no ________arguing with Bill because he will never change his mind.
At the meeting they discussed three different ________o the study of mathematics.
The ________on his face told me that he was angry.