He has worked the maths problem for nearly an hour but he simply can’t work it .On ;at B. on ;out C. at ;up D. for ;out
__________,the com-pass was first made in China.
Jim is known __________ the police __________ a criminal.
Ted came for the weekend wearing only some shorts and a T-shirt,__________ is a stupid thing to do in such weather.
She has a gift for creating an atmospherefor her students __________ allowsthem to communicate freely with each other.
In China, the number of cities is in-creasing __________ development is recognized across the world.