下列文件格式中，不属于音频文件的是____。

以下对视频格式文件的描述中，不正确的是____。

下列选项中，属于音、视频播放软件的是_____。

下列四种文件格式中，属于音频文件的格式是______。

以下选项中，用于压缩视频文件的压缩标准是_____。

Either he or I ______to the airport.

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

Duty is an act or a course of action that people ______you to take by social customs, law or religion.

下面文件格式中，不属于视频文件的是______。

Project ______is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

It will be a relief over the death of a friend or a relative if the friend or relative dies from ______.

Hurry up, or you ______ catch the train.