[ Grammar and Vocabulary ]
The sun is a very important …… of energy.
A. source
B. force
C. means
D. method

Random Topics:
Present TenseHabitual and Continuous TensesGrammar - Be going toAsking and Giving SuggestionSimple Future - PassiveConnectorsMain Idea and Sentence StructureSimple Past TensesEnglish MorphosyntaxNoun and PronounOther quiz:
Simple Tenses › ViewLast year, I _________ nouns or naming words in your class.
A. teached
B. teach
C. taught
D. will teach
Future Tenses › View
It’s probable that I’ll _______ my first driverless car by 2050.
A. be buying
B. have bought
Pronoun › ViewThe Italian boy has two bicycles. One is a touring bicycle, and … is a BMX.
- other
- the other
Grammar › View
Whenever you are lonely, just ______ me a call.
A. gives
B. giving
C. to give
D. give
