The teacher said that Columbus America in 1492.(2012~2013 .河北邢台一中)
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. —________.
She started singing to the baby and was ________ with a smile.
Was it on a lonely island ________ he was saved one month after the boat went down?(2011·四川)