The reason for making a decision is that a problem exists, or something is standing ______the way of accomplishing them.

In ______, the only element that can be deleted or removed is the one that was inserted most recently.

Either you or one of your students ______ to attend the meeting that is due tomorrow.

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．

It is generally considered unwise to give a child___( )_____ he or she wants.

 ______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

Scientists say it may be five or six years _____ this medicine is tested on human beings.

I think you should end it ______ it is too late, or you will be sorry for it.

It is the ability to do the job ______ matters not where you graduate from or what you are.

By saying “While it’s true that ..., be they scientific or artistic” (Lines 1-3, Para.5), the author means that _____.