Once ____ in the forest, you ought to remain ____ you are waiting for help．

_______ the difficult maths problem, she felt relieved.

More attention must be paid _________ the endangered animals..

With the death of Libyan leader Muammar Gadhafi on Thursday, the country’s new leaders ______ the challenge of rebuilding a war-torn nation. [ ]

Is Kobe Bryant________ American basketball player—Yes. He’s from Pennsylvania (宾夕法尼亚州)．