— What on earth are the police busy with?— They have been looking into how the plane crash _______.
The fact that so many people still smoke in public places ______ we may need a nationwide campaign to raise awareness of the risks of smoking.
Sam has been appointed _______ manager of the engineering department to take ____ place of George.
—Where is the shooting centre? —It is about 50 kilometres ______ the city of Beijing.
Though difficult, I ________ him find a job, which made him very pleased.
He was inspired to start again _________ he had failed.