The family______ having dinner when the guest came.
A. is
B. was
C. were
D. are
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The police______ looking for the murderer.
A. am
B. is
C. are
D. be
Neither you nor I______ a student.
A. is
B. are
C. am
D. were
Both of my parents______ teachers.
A. is
B. are
C. am
D. was
某栋普通房建筑造价1000万元,据此估计建筑材料费用大约下列哪一种?
A. 250万元
B. 450元
C. 350元
D. 500万-600万元