——Will you come to my office when you your work? ——Sure.
Our efforts resulted________failure.I think I’m also responsible________it.
When was it________you let out the secret?
-- Have you seen ______pen? I left it here this morning-- Is it ______black one? I think I saw it somewhere
Great changes ______ in the past few years, and a lot of factories ________.
—What about going for a walk?—______.