A．教师 实施者 B．学生 参与者C．行政领导 参与者 D．校长 实施者______是实施新课程改革的主力军，……

单项选择题—What was your impression of last night's lecture —Speaking ______, I thought it was rather boring.

单项选择题—It was very crowded ______ I went there last night. —I don't care whether it's crowded or not. I'd like to see it anyway.

单项选择题小学英语课堂唱英语歌，应要求______。