With time _______, we didn’t do enough preparation for this examination.
The farm grows various kinds of crops, _______ wheat, corn, cotton and rice.
The boss insisted that every minute ______ made full use of ______ the work well.
Rather than _______ here waiting, I prefer _______to find out what on earth has happened.
The novel was concerned ______ the Second World War, while most readers are more concerned _____ the hero's love story.
The police chief advised his men to keep________ and not lose their tempers.