[ Interrogative Pronouns ]
__________ mobile phone is that?
A. Who
B. Whom
C. Whose

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Vocabulary › Viewtwo objects rubbing together, one object slows down
A. motion
B. stop
C. force
D. friction
Grammar › View
You can _________ any new words in the dictionary.
A. practice
B. write
C. look up
D. watch up