____ is believed that heavy smokers are more likely to develop serious illness.
As
B. It
C. Which
D. What
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填入正确的代词形式。These are your books, Kate. Put ___ in the desk, please. (they)
____ must look after ____ things. (you)
-Are these ____ (you) pencils?-Yes, they are ____(our).
____(I)dog is white. But ____ (she) is black.
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