The U.S. official said North Korea --- and Iran --- should follow in the steps of Libya, which last December said it would work__________ to allow international weapons inspectors to do their work. 

(2013·大连24中模拟)Good health is the basis for students to ________ carry on with their studies and to do any other activity.

“If you’re walking down the right path and you’re willing to keep walking,_____ you’ll make progress”, said the president Obama.

In the TV ad, the actress is asked to jump with her mouth ________ open, showing her ________ teeth.

—Why are you so late?—The driver couldn’t see clearly because of the fog．____, the road was too icy．