Either he or I ______to the airport.

How much one enjoys himself travelling depends largely on_____he goes with，whether his friends or relatives．

______ it or not , his discovery has created a stir in scientific circles.

The machine he originated and perfected has no modern _____ or ancient prototype.

Virginius would feel more or less guilty when he______.

Virginius would feel more or less guilty when he _____.

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.

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