The pandemic（疫情） is under control now and our life is back to ____________.
A. normal
B. normally
C. innormal
D. abnormal
It is really a ___________ for me to study with you here.
A. please
B. pleased
C. pleasure
D. pleasing
My mother doesn't like the red sweater, so I have exchange it __________ a green one.
A. with
B. into
C. to
D. for
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