I ran across David while walking along the street yesterday. I ________ him for three years.
We have to admit that the biggest___________ facing the ecosystem is limited resources and the worsening environment.
Your task will be to examine the___________ of constructing a new factory in the United Kingdom.
His friends were ___________and encouraged him to publish his ideas, but Copernicus was cautious.
The opportunities available will depend on your__________work experience and qualifications.
The consulting room is in a mess; I wonder why the doctor didn’t get everything _______before starting to see his patients.