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.
An increasing number of students,year by year,across China _______ hard to realize their dream of studying abroad.
I’m very tired. I _______ on the night shift for several weeks.
Why don’t you put the fruit in the fridge? It will _______ fresh for several days.
It was not until then that I came to know that knowledge _______ only from practice.
—Where _______? —I got caught in the traffic, or I would have been here sooner.