With the rise of modern communication tools, handwritten letters ______ by emails. 
#100623
A
will replace
B
have replaced
C
are replaced
D
are being replaced
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The house is dirty because it  since they moved out.
#100966
A
doesn’t clean
B
isn’t cleaned
C
hasn’t cleaned
D
hasn’t been cleaned
. Tom as well as his classmates __________ a song when the teacher came into the classroom.
#103734
A
are singing
B
were singing
C
is singing
D
was singing