[ Linking Verb ]
………energy sources like coal and oil contribute to environmental pollution.
A. Computer-controlled
B. Eco-friendly
C. Renewable
D. Non-renewable

Random Topics:
Adverbs or Adjectivesanother/the others/each other/one anotherZero and First ConditionalsConjunctionsAsking & Giving AttentionIf Conditionals“Put” Phrasal Verb3rd Person SingularPast Simple and Past ContinuousTime Clauses of FutureOther quiz:
Grammar › ViewIf Deren —- a car, he —- us to school.
A. buys, will drive
B. bought, would drive
C. had bought, would have driven
Grammar › View
Is the following group of words a sentence or fragment?
The campsite is available for three nights.
A. Sentence
B. Fragment
English Article › ViewJoanna wants to buy ___ umbrella.
A. a
B. an
C. the
Vocabulary › View
The country has a lot of ___ you can see many farms when you go there.
A. estimate
B. grassland
C. farmlands
