1. Dont talk about such things of __________ you are not sure.
A. which B. what C. as D. those
2. Is this the factory __________ you visited the other day?
A. that B. where C. in which D. the one
3. Is this factory __________ some foreign friends visited last Friday?
A. that B. where C. which D. the one
4. Is this the factory __________ he worked ten years ago?
A. that B. where C. which D. the one
5. The wolves hid themselves in the places __________ couldnt be found.
A. that B. where C. in which D. in that
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