★ TOEFL
Only when air and water seep through its outer coat ___________.
A. does a seed germinate
B. to the germination of a seed
C. a seed germinates
D. for a seed to germinate
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Thunder occurs as ____________ through air, causing the heated air to expand and collide with layers of cooler air.
A. an electrical charge
B. passes an electrical charge
C. the passing of an electrical charge
D. an electrical charge passes
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