It was not until the subprime loan crisis(次贷危机) ____ great damage to the American financial system that Americans ____ the severity of the situation.
—Will you lend me some paper? —Sorry,mine ______.
—Have you forgotten anything,sir? —Oh,I forgot to pay.You see,I'm terribly sick,but I ______ to.
I advised that he ______to the hospital at once,but he insisted that he ______quite well then.
—Why are most of us unable to study English well,Mr.Li? —You ______.But you ______ too little attention to it.
—Jim,would you like to take tomorrow's driving test? — ______.