[ Grammar ]
Kai observed that avian species ____ their offspring the art of flight.
A. teach
B. learn
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Adverbial Clause of Cause and Effect › ViewTomorrow is a holiday __________ we don’t have to go to school.
A. Because
B. In order that
C. Since
D. So that
Modal Speculation › View
He _______ known the answer to the question.
A. might have
B. could have
C. must have
D. should have