Look! The boys are making the model boat by_________.
A. himself
B. themselves
C. ourselves
D. yourselves
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Are you looking for ____(him,he,his)?
--Is this bag Betty's?---No,it's not ___.it's Tina's.
We are working hard on ____(we) project.
My flat is on the third floor。 ____ (they) is on ther tenth floor.