[ 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:

Random Topics:
used to, be used to, get used toTenses and VoiceGrammar: Imperative and Exclamatory SentencesConnectivesVerb Tenses and SubordinatesGrammarCommon & Proper NounsPronunciationSimple Past and Past Progressive TensesTransitional Phrases and ConjunctionsOther quiz:
Vocabulary › Viewincluding all necessary parts; whole
A. complete
B. concern
C. coax
Grammar and Vocabulary › View
A: Is there an elevator in the hotel?
B: No, ________.
A. it isn’t
B. there isn’t
C. there it isn’t
