The graduating students are busy _______ material for their reports.
Contemporary English is quite different from Old English. There has never been a year____the language was not changing.
To help a friend solve the problem troubling him,.
Not until all the fish died in the riverhow specious the pollution was.
a reward of $1,000 will be given to can provide any clues to the case which has been investigated by the police for nearly half a year.
—What caused the party to be put off? —_________the invitations.