One of the boys is ______, all the other boys are ______.

单项选择题The head of the executive branch in New Zealand is______.

单项选择题It is reported that the police will soon ______ the case of two missing children.

单项选择题() Yellow River is the second longest river in our country.

A. /
B. The
C. An
D. A

单项选择题小学英语课堂唱英语歌，应要求______。

单项选择题班集体形成的条件和前进的动力是______。