—-, some of the Earth’s interior heat escapes to the surface.
A. A volcano erupts
B. A volcano whether erupts
C. A volcano erupts it
D. If a volcano erupts

Random Topics:
Relative & Interrogative PronounsTransitional WordsSimple Present and Past TenseTenses and ArticleIdentify The TensesVerb AbilityGrammar and PrepositionAdverbs of TimeComparisionPresent Perfect vs Past Simple TenseOther quiz:
Grammar › ViewThe study, published in the Journal of Veterinary Medical Education, has concluded that, used in the right way, tablet PCs can be of ____ great use in this particular
educational discipline.
A. a
B. an
C. the
D. no article
Tenses › View
He ___________ a sandwich for lunch.
A. Are making
B. is making
C. Are make
D. is make
Relative Clauses › ViewThe place _____ we visited was amazing.
A. who
B. whom
C. whose
D. which
Grammar › View
Which sentence uses correlative conjunctions?
A. The weather is so good that we should go somewhere.
B. The path by the river will take us past some statues.
C. We can either go to the park or walk beside the river.
D. One of the ponds in the park has a family of ducks.
