Up to now, we _________(not receive) any news from her. 2. I had intended to call on you yesterday, but someone _________(come) to see me. 3. As a school boy I already knew the sun ________(be) the center of the solar system. 4. I have worked here since I _________ (graduate) from college. 5. By the time you get back, great changes __________(take place) in this area.