A:being; could
B:going; should
C:were; might
D:went; would
25=____×4+____
25÷4=____……____
用下面的词语造句
①无所不知:
②兴高采烈:
某口袋里现有8个红球和若干个绿球(两种球除颜色外,其余完全相同),某同学随机的从该口袋里摸出一球,记下颜色后放回,共试验50次,其中有20个红球,估计绿球个数为( )