[ Causative Verb ]
Epilepsy —- to be caused by poor air, which —- to be carried by the veins to the brain.
A. Is believed / thought
B. Believes / is thought
C. Was believed / was thought
D. Is believing / is thinking

Random Topics:
Conjunctions, Interjections and DeterminersPreposition and AdjectiveSentencesClauses and GerundsTenses and ArticlePronounsPrepositions of Place & TimePerfect Progressive TensesMay, MightComparative AdverbOther quiz:
Modal Verbs › ViewYou …………………… buy a bus ticket – I’ll buy one for you.
A. don’t have to
B. mustn’t
C. should
D. need
Gerund & Infinitive › View
My uncle claims…………… (be) the owner of the case.
A. to be
B. being