If the product does absorb moisture or ________ water, discard it

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

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.

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

—Hurry up, or we’ll be late.—Take your time. it’s just ______ short distance from here to ______ cinema.

—How long does it take us to go to your hometown from here?—It takes us ______ hour or more to go to my hometown by ______ train.

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