[ Modals ]
So far scientist have not ___ to successfully devise a mechanism
A. been able
B. need
C. must

Random Topics:
Narrative Tenses & ConditionalsVocab CheckingDemonstrative PronounGrammar RulesGerunds and InfitinitivesBe Going To vs. WillModal Verb Gerund or To InfinitivePresent ContinuousSpeculation with Modal VerbsFrequency AdverbsOther quiz:
Sentence Structure › ViewThe new educational curriculum focuses on developing critical thinking skills and encouraging creativity among students.
A. Simple (S)
B. Compound (Cpd)
C. Complex (Cpx)
Tenses, Tag Questions, Phrasal Verbs › View
Analyse whether the sentence given is true or false.
They were discussing, were they?
A. FALSE
B. TRUE
Grammar › ViewWhat is the correct abbreviation for October?
A. Octo.
B. Oct.
C. Oct
D. Octob.
Indefinite Pronouns › View
______ bought me a drink yesterday.
A. Something
B. Everybody
C. Someone
D. Somewhere
