We need to get to the root of the problem______ we can solve it.
A. while B. after
C. before D. as
a single world can change the meaning of a sentence, a single sentence can change the meaning of a paragraph.
A. Just as B. Even though
C. Until D. Unless
If you miss this chance, it may be years ____ you get another one.
A. as B. before
C. since D. after
_____the damage is done, it will take many years for the farmland to recover.
A. Until B. Unless
C. Once D. Although
You won’t find paper cutting difficult _____you keep practicing it.
A. even if B. as long as
C. as if D. ever since
—What do you think of the movie last night?
—When I got there it _______, so I only watched the end.
A. finished B. had finished
C. was finishing D. has finished