A good teacher must be able to help his students learn the subject with great interest ______ he reaches the last minute of the class.
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.
Generally speaking, ______according to the directions, the drug has no side effect.