[ Modal Verbs ]
They ___ be lost. They’ve been driving around for hours.
A. can
B. must
C. may
D. might
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Vocabulary › Viewthe ability to be maintained at a certain rate or level
A. energy conservation
B. human impact
C. renewable resources
D. sustainability
E. availability
Modal Verbs › View
Perhaps the teacher is in the staff room. The teacher __________________ be in the staff room.
A. Must
B. Might
C. Can’t
D. Has to