There _________________ six countries in SCO (上合组织) at first, but now the number has increased to eight.
A. is
B. are
C. were
D. will be
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There _______ a big tree in front of my house. I could hear many birds sing in it.
A. is used to be
B. used to be
C. used to have
D. was used to be
There _____ some fruit and vegetables in it.
A. is
B. are
C. have
D. be
There ________a teacher and thirty students in the classroom.
A. has
B. have
C. is
D. are
There ________ some milk and two eggs on the table.
A. is
B. are
C. has
D. were