After many years of hard work，the man has finally reached the stage________he has gained good fortune and social status

Robert has rich work experience, so it will for his lack of academic knowledge

Pity you missed the lecture on nuclear pollution.—I _______ it ,but I was busy preparing for a job interview.

Someone is knocking at the door. Who may it be–It ______ be Tom. He is still in the school.

Here comes the bus. Let’s ________.