When we entered the room, the lights suddenly.
This building is both a secret and a mystery. No one shall be admitted into it ______ he can give the right password.
— Where did you buy this beautiful skirt? — It was in the shop ______ my mother is working.
China’s hurdler Liu Xiang was disqualified due to false start in the 60-metre event, ______ his rival Dayron Robles of Cuba an easy win of 7.66 seconds.
Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should deal with properly.
A Pakistani intelligence official confirmed that the three-storey compound where Bin Laden spent his last years and was killed would be ______.