[ 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:
Modals of Obligation › ViewYou ……………………… eat in class. It´s forbidden.
A. don´t have to
B. can
C. shouldn´t
D. mustn´t
Vocabulary & Grammar › View
quiet is to loud as slow is to______
A. green
B. fast
C. sluggish
D. loud
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