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Europe is … smallest continent on Earth.

A. An
B. A
C. The
D. –

The __________ of the theory made it hard to understand.

A. clarity

B. simplicity

C. precision

D. abstract

I am writing a book … grammar.

A. in

B. on

C. at

Tools or equipment made by applying scientific knowledge.

A. technologies

B. welfare

C. researchers

D. domesticated