_____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
--- Hello, Tom. This is Mary speaking.
--- What a coincidence! I_________ about you.
A. just thought B. was just thinking
C. have just thought D. would just think
—Has James arrived at the hotel?
—No, he ______ by fans for photographs at the airport.
A. has surrounded B. would surround
C. was surrounded D. is being surrounded
When and where this took place _____ still unknown.
A. is B. has
C. were D. are