—How long will it be ________ the 30th Olympic Games is held in London? —It won’t be two years, I think.
At the foot of the mountain________.
I've tried very hard to improve my English.But by no means ________ with my progress.
Not until then ________ how important the brakes were.
________ to come over to have a talk with him in those days.
—My cousin is very clever but he doesn't work hard at his lessons. —________.