[ Grammar ]
Most climate scientists agree the main cause of the current global warming trend is human expansion of the greenhouse _______.
A. causes
B. effect
C. gas
D. damage

Random Topics:
Tenses - AuxiliariesPersonal Pronouns and VerbVerb Patterns / IngBe going to / WillNarrative, Past TensesPresent Perfect and Past SimplePast Continuous Tense & Past ModalsModals and Present TensesVerbs + Gerund or InfinitiveSecond and Third ConditionalOther quiz:
Grammar › ViewA Yamaha motorcycle has a …………… engine.
A. powerless
B. powered
C. powerful
Grammar › View
The taste is different……….what I had expected.
A. with
B. from
C. about
