[ Grammar ]
The Earth’s magnetic field, ______________ protection deflects charged particles from the sun, is crucial for life.
A. where
B. when
C. which
D. whose

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Vocabulary › ViewThe pool was so _________ I didn’t even get my hair wet.
A. shallow
B. searching
C. attractive
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Grammar › View
Many British people let ………. fireworks on Guy Fawkes Night.
A. up
B. on
C. off
D. in