There are some ______________in these ______________.
A. knifes pencil-boxes
B. knives pencil-box
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____writer is better known in China, Charles Dickens or Mark Twain?
A. Which
B. Whether
Kate and her sister went to holiday with a cousin of _____.
A. their
B. theirs
The boy ____ ill today.
A. are
B. is
I ____ a worker next year.
A. am
B. will be