When and where this took place _____ still unknown.

A. is B. has

C. were D. are

—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

--- 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

—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

You won’t find paper cutting difficult _____you keep practicing it.

A. even if B. as long as

C. as if D. ever since

_____the damage is done, it will take many years for the farmland to recover.

A. Until B. Unless

C. Once D. Although

If you miss this chance, it may be years ____ you get another one.

A. as B. before

C. since D. after

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

We need to get to the root of the problem______ we can solve it.

A. while B. after

C. before D. as

There is only one more day to go your favorite music group play live.

A. since B. until

C. when D. before