[ 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:
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