—OK，I'll buy it for you．
A：It's too big.
B：It's the right size for me．
C：It's too small．
数列{an}是等差数列，a5=9,a7+a8=28，，则a4=( )
She was waiting for them to call out the ____(win) in the dancing competition.
下列叙述错误的是（ ）
