For holidays, many people visit the Great Barrier Reef _______ the northeast coast of Australia, _______ has more than 600 islands.
____ be sent to work there?
There was a terrible noise _____ the sudden burst of light.
If a thing is worth ______, it must be well ______.
I, who ____ your teacher, will try my best to help you with your English.
All that can be done _______.