—Could you please tell me ? —Yes, she came to teach here just last week.
– How long has Robot _________ ?– Since2004.
Great changes _________ in Nanjing since the1990s.
My mother _________ a history teacher.
–Have you finished your homework?– _________ . Just half of it. How about you?
– _________ you ________ your lost football?_Yes, I have. I _________ it an hour ago.