Though it is the first time they have met, they talked as if they _____ friends for many years.
In recent years much more emphasis has been put______ developing the students productive skills.
_____ of water makes Death Valley a desert, but it is by no means devoid.
No matter how frequently _____ the works of Beethoven always attract a large number of people.
Under no circumstance _____ to tell lies to parents.
"_____ your meeting is!" he offered them his sincere congratulations.