Select your answer:
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Past ContinuousPhrasal Verbs with up and downVocabulary and DefinitionsCountable QuantifiersBe used to vs used toComparatives and ConjunctionsWill vs Verb InfinitivesPassive Voice - Past SimpleGrammar - too & enoughAuxiliary Verbs, if, unless and ModalOther quiz:
Passive Voice › ViewThe newspaper is going to be delivered in the morning.
A. Active
B. Passive
Grammar › View
Scientists now know that the lack of an embryonic thumb in birds is why ____ almost impossible for birds and dinosaurs to be related.
A. is
B. it is
C. is it
D. it