The teacher’s explanation the puzzling problem.
A. understood
B. calculated
C. facilitated
D. clarified
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This work is enough to run everyone down.
A. interesting
B. exhausting
C. frustrating
D. dedicating
She couldn’t stand the of not being able to help.
A. difficulty
B. dilemma
C. frustration
D. devotion
the students with better health are more attentive in class.
A. First of all
B. Furthermore
C. What’s more
D. By and large
He urged them to minor differences for the sake of peace.
A. set up
B. set out
C. set aside
D. give away
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