1_____education is the instruction that occurs when the instructor and students are separated by distance or time,or both

If a boy or a girl has grown up in a home with sharing tasks and decisions，he or she will probably______.

计算机操作系统的主要功能是______。

Either he or I ______to the airport.

以计算机硬件为基础，根据网络服务的要求，直接利用硬件与少量软件资源专门设计的网络操作系统是 ______。

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.

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．

计算机网络系统是 ______。

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.

计算机操作系统的功能是______。