Thunder occurs as ____________ through air, causing the heated air ...

[ TOEFL ]

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

Select your answer:
A B C D E

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Choose the correct sentence.

A. Swinging the door open quietly the two police officers surprised a young burglar as he worked to disconnect the cable wire from the television set.
B. Swinging the door open quietly, the two police officers surprised a young burglar as he worked; to disconnect the cable wire from the television set.
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D. Swinging the door open quietly, the two police officers surprised a young burglar as he worked to disconnect the cable wire from the television set.