[ Grammar Modals ]
Experts say there might ______ (be) only 540 Amur tigers left in the world today.
A. been
B. have be
C. be
D. been

Random Topics:
Present Simple and Modal VerbsGerunds & Infinitives + VocabularyPast Tense vs Future TenseAdverbs by TypeFuture Perfect TensePast Perfect TenseAdjectives and comparisonsCardiology ServicesPresent Perfect - Just, Already, YetModals of AdvisabilityOther quiz:
Grammar › ViewCalm down. There is ____ to worry about.
A. nothing
B. anything
C. something
D. everything
Past Modals › View
I haven’t got my wallet. I ____ left it at home.
A. should have
B. must have