下列各句,没有语病的一句是( )
If Greeks and Turks had not helped each other after the earthquakes five years ago,they____ mortal enemies instead of friendly neighbors later on..
derstandings_____ from lack of social communication, unless _____ with properly, may leadto serious problems.
I remember _________the factory owed a small workshop and two machines.
Children under 12 years of age in that country _____ be under adult supervision when in a public library. [ ]