It is ________ the pupils do in their spare time ________ really prepares them to take their place in society as citizens when they grow up.
______ advice I give him , he just does not listen.
—How would you like your coffee? —_______.
That passenger was very impolite to the conductor, ______, of course, made things even worse.
His experiment done in ______ summer of 1970 was ______ failure.
Once natural resources _____ , the consequence will be unimaginable.