.—Must I turn off the gas after cooking ? --Of course . You can never be ___ careful with that.
I have _____ all my papers but I still can't find my notes.
—Now that you like computers very much, isn't that a good idea to get a ____? —Well, I'd like to, but I can't afford such an expensive computer at present.
I have many friends, ____ some are businessmen.
The car has been well maintained and is _____ excellent condition.
—Why was Professor Johnson unhappy those days? —Can't you see it clearly? The only reason was that the theory he stuck to_____ wrong.