[ Grammar ]
Scientists think there ________ at least five mass extinctions in Earth’s history.
A. will be
B. are
C. have been
D. has been
Random Topics:
Past Simple - Present PerfectVerb AgreementPassive Voice and ModalsPresent Perfect and Present Perfect Progressive TensesModal Auxiliaries and Similar ExpressionsModal AuxiliariesGrammar - Collective NounsPresent Simple Positive and NegativeGrammar - used toSentence LabelingOther quiz:
Present Progressive or Present Simple › View________ Shira __________ fish?
A. Do, likes
B. Does, likes
C. Is, liking
D. Does, like
Grammar › View
Joe is very competitive and always strives to _____ in everything he does.
A. excellent
B. excellence
C. excels
D. excel
Vocabulary › ViewWhat is the antonym for “abridge”?
A. Expand
B. Shorten
C. Elaborate
D. Clarify
Grammar › View
Have you ever ________ to China?
A. went
B. go
C. been
D. gone