The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
In order to find the missing child, villagers _______ all they can over the past five hours.
Many people prefer large cars, __________________large cars are safer than small ones.
— Who is absent from the lecture today? —_____________you ask? Peter, of course.
— Finished?— No, I’ve got __________________three questions to answer.
Brian was about to_______________ when he suddenly found an answer to the question.