[ Passive Voice ]
New areas ……….. explored.
A. Must be
B. Should
C. Should be
D. Can’t

Random Topics:
Tenses PracticeDegrees of ComparisonSimple Tenseslike/do not likeDo not or Does notAdjectives (-ed / -ing)Modals and Modal PerfectsAdjectives and ArticlesPast and Present ContinuousPresent Perfect - Just, Already, YetOther quiz:
Tenses › ViewI’ve been playing football ________.
A. two hours ago.
B. yesterday.
C. all day.
Grammar › View
I never have problems sleeping on buses or planes. I can sleep _______.
A. somewhere
B. nowhere
C. anywhere