[ Grammar ]
What is the main purpose of our immune system?
A. To help us move
B. To help us breathe
C. To help protect us from bacteria and viruses
D. To help our hair grow

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Grammar › ViewThe man _______ she wanted to see her family.
A. which
B. where
C. whom
D. who
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The film ____ we saw last week won three awards.
A. when
B. who
C. whose
D. which
Earthquake waves travel slowly through the hotter parts of the ______ and speed up in colder, denser areas.
A. kinetics
B. mantle
C. lipids
D. latitude
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You’ve … it in pencil.
A. wrote
B. writen
C. written
D. writed