When she was in college, Sophia ______ as a teacher in the small town for several months.
A.had volunteered B.volunteered
C.has volunteered D.is volunteering
Most _______ labor in the past has been replaced by modern machines.
A.manual B.liberal C.fragile D.casual
—The hillside village remains primitive and unspoiled.
—That explains ______ people desire to explore such a remote place.
A.how B.where C.when D.why
In case of fire, we must follow the emergency ______ to ensure our safety.
A.predictions B.proportions C.procedures D.pressures
______ most of us are satisfied with the nutrients we’re getting from our diets, they are actually far from enough.
A.While B.If C.Since D.Before
The company has ______ the gas supply temporarily to repair the damaged gas pipe.
A.cut in B.cut up C.cut off D.cut out
