Some researchers believe that there is no doubt ______ a cure for AIDS will be found.
_____ their real economic situations, they got some relief fund from the government.
No matter how frequently _____ the works of Beethoven always attract a large number of people.
The great use of school education is not so much to teach you things _____ to teach you the art of learning.
I heard that you really had a wonderful time at John's birthday party, _____?
Modern science and technology has _____ communication between people far apart.