the safety of gas, the government has checked the city’s gas supply system thoroughly.
Why don’t you bring ______ to his attention that you are too busy to do it?
They live on a busy main road. ______ must be very noisy.
They are good friends. _______ is no wonder that they know each other so well.
Does ________ matter if he can’t finish the job on time?
— I don’t know whether I should go abroad or not, Mum.— I leave _______ to your own judgment whether you should do it.