[ Geography ]
The Core of the earth is made up of…
A. Mainly of iron in the liquid form
B. Mainly of nickel in the liquid form
C. Both iron and silica in the liquid form
D. Both iron and magnesium in the plastic state
Select your answer:

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A. took on
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Fill in the blank: I (to read) a book at the moment.
A. will read
B. was reading
C. am reading
D. am read
